DP Biology Questionbank

Description

Overview of the essential ideas for this topic.

3.1: Every living organism inherits a blueprint for life from its parents.

3.2: Chromosomes carry genes in a linear sequence that is shared by members of a species.

3.3: Alleles segregate during meiosis allowing new combinations to be formed by the fusion of gametes.

3.4: The inheritance of genes follows patterns.

3.5: Biologists have developed techniques for artificial manipulation of DNA, cells and organisms.

Directly related questions

• 15M.1.SL.TZ2.13: Which individuals are colour blind in this Punnett grid? A. XB YB. XB XBC. Xb YD. XB Xb
• 15M.1.SL.TZ2.16: What was an aim of genetic modification of organisms?A. To provide stem cells from embryos for...
• 15M.2.SL.TZ2.6c: Discuss ethical issues of therapeutic cloning in humans.
• 15M.1.HL.TZ2.8: What is a characteristic of the human Y chromosome? A. It is made of DNA and histones covered by...
• 13M.2.SL.TZ1.7a: Define codominant allele, recessive allele, locus and sex linkage.
• 13M.1.HL.TZ2.11: One type of gene mutation involves a base substitution. What are the consequences of the base...
• 13M.1.SL.TZ1.14: A body cell of a goat has 60 chromosomes.  What would be produced following meiosis in the testis...
• 12M.1.HL.TZ2.13: Which is a source of chromosomes for pre-natal diagnosis of abnormalities by karyotyping? A....
• 12M.1.SL.TZ1.16: His wife does not carry the hemophilia allele. What would be expected in their children?
• 09M.2.SL.TZ1.1c: Evaluate the efficiency of the types of Bt maize studied, in controlling the three species of...
• 09M.1.HL.TZ2.38: What procedure(s) could have been involved in the creation of the karyotype? I. Chorionic villus...
• 09M.1.SL.TZ2.9: If the haploid number of a species is 14, how many chromatids will there be in metaphase I in a...
• 10M.2.HL.TZ1.3a (i): Deduce with reasons for your answer, whether the chromosomes are autosomes or sex chromosomes.
• 10M.2.HL.TZ1.3a (ii): Deduce with reasons for your answer, whether the chromosomes are homologous or non-homologous.   
• 10M.1.SL.TZ2.15: A man of blood group A and a woman of blood group B have a child. If both are heterozygous for...
• 10M.1.SL.TZ2.16: Which disease is an example of sex-linked (X-linked) inheritance? A. AIDS B. Down syndrome C....
• 10M.2.SL.TZ2.3a: Define the term allele as used in genetics.
• 11N.2.HL.TZ0.7 a: Define the terms chromosome, gene, allele and genome.
• 12N.2.SL.TZ0.6c: Discuss the benefits and possible harmful effects of altering species by one example of genetic...
• 10N.2.HL.TZ0.1e(ii): Compare the results between the plants treated with short-day light and the plants treated with...
• 15N.1.HL.TZ0.12: What is the chromosome number in a human gamete with non-disjunction? A. 46 B. 45 C. 24 D. 23
• 15N.2.HL.TZ0.5b: Outline a technique used for gene transfer.
• 13N.1.SL.TZ0.12: What is the difference between dominant, recessive and codominant alleles?
• 13N.2.SL.TZ0.4c: Albinism is inherited as a recessive trait; the alleles of the gene involved are A and a. An...
• 13N.2.HL.TZ0.8c: Sickle-cell anemia affects the ability of red blood cells to transport oxygen.Explain the...
• 16M.2.HL.TZ0.1i: Suggest an ethical advantage of using this type of therapy over embryonic stem cell therapy.
• 16M.2.SL.TZ0.4a: Label the parts of two paired nucleotides in the polynucleotide of DNA.
• 15M.1.SL.TZ2.15: What is a possible source of the chromosomes used for pre-natal karyotype diagnosis?A. The...
• 15M.2.SL.TZ2.1d (i): Suggest a reason for the decreases in the incidence of malaria from 1995  to 1999.
• 15M.2.SL.TZ2.1d (ii): Suggest a reason why the incidence of malaria is so low in the Belize District.
• 13M.2.HL.TZ1.6b: Factor IX is a blood clotting protein which some hemophiliacs lack. In the future hemophilia...
• 13M.1.HL.TZ1.15: Alkaptonuria is an inherited condition in humans that affects phenylalanine and tyrosine...
• 13M.2.SL.TZ2.2b: Clouded leopards live in tropical rainforests of South-East Asia. The normal spots (brown with a...
• 13M.2.SL.TZ1.7b: ABO blood groups are inherited from parents, but it is possible for a child to have a different...
• 11M.1.HL.TZ1.15: Which statement about the polymerase chain reaction (PCR) is correct? A. PCR allows DNA to be...
• 11M.2.HL.TZ2.7a: Describe the causes of Down syndrome.
• 11M.1.SL.TZ2.17: Sickle-cell anemia is caused by a mutation. How many changes to the amino acid sequence are...
• 12M.1.HL.TZ1.13: A certain breed of mouse can have fur that is either black or brown. A mouse breeder performs a...
• 12M.1.HL.TZ2.11: What is a gene mutation? A. Failure of chromosome pairs to separate properly during cell...
• 12M.1.HL.TZ2.14: What is a plasmid? A. Chloroplast DNA B. Mitochondrial DNA C. Small circle of DNA that can...
• 12M.1.SL.TZ1.13: The sequence of the first six amino acids of the normal β hemoglobin (HbA) chain are...
• 12M.2.SL.TZ1.6b: Outline the inheritance of a named sex-linked condition in humans.
• 12M.1.SL.TZ1.17: What makes gene transfer between species possible? A. All species use the same genetic code. B....
• 09M.2.HL.TZ1.1b: Discuss which species of stem borer was most successfully controlled by the genetic engineering...
• 09M.2.HL.TZ1.1d: Evaluate the use of Bt maize as a food source on the growth of the rats.
• 09M.2.HL.TZ1.5a: Outline a possible cause of Down syndrome.
• 09M.2.HL.TZ2.3c: Describe the inheritance of colour blindness in humans.
• 09M.2.SL.TZ1.1e: Describe the change in mean mass for the female rats during the 90-day experiment.
• 09M.1.SL.TZ1.15: Which phase of cell division is photographed in order to make a karyotype? A. Anaphase of...
• 10M.2.HL.TZ1.3c: Determine the combinations of alleles that would be present on each chromatid. Use the diagrams...
• 10M.1.SL.TZ2.17: The diagram below represents the results obtained in a DNA profile from a crime scene. Suspect...
• 11N.2.SL.TZ0.4a (iii): If person 3 has a son, and the father is a hemophiliac male, predict the son’s phenotype.
• 10N.2.HL.TZ0.1e(i): State the overall effect of overexpression of the OsGI gene in plants treated with short-day light.
• 10N.2.HL.TZ0.1g: Evaluate, using all the data, how modified varieties of rice could be used to overcome food...
• 09N.2.SL.TZ0.7a: Describe karyotyping and one application of its use.
• 15N.1.HL.TZ0.13: In a human with type A blood, what determines the blood group? A. Sex chromosomes B. One or two...
• 13N.1.SL.TZ0.11: What is the composition of eukaryotic chromosomes?A. DNA onlyB. DNA and riboseC. DNA and RNAD....
• 09N.1.SL.TZ0.13: The blood groups of a mother and four children are indicated on the pedigree chart below. What...
• 16N.1.SL.TZ0.13: What is produced by somatic-cell nuclear transfer? A. Adult sheepB. Cloned embryosC. Rooted...
• 16M.2.HL.TZ0.5c: Many genetic diseases are due to recessive alleles of autosomal genes that code for an enzyme....
• 16N.1.HL.TZ0.11: What is the major health issue resulting from the Chernobyl nuclear accident in 1986? A....
• 17M.1.HL.TZ1.26: A DNA profile was made of one individual in a paternity suit. Locus B was used to distinguish...
• 17M.2.SL.TZ2.4a.i: State one type of environmental factor that may increase the mutation rate of a gene.
• 17N.1.HL.TZ0.10: The image shows a karyogram. [Source:...
• 17N.1.HL.TZ0.12: A dominant autosomal allele for lactase persistence allows humans to digest milk as adults....
• 15M.1.HL.TZ1.11: The presence of freckles is a characteristic controlled by a dominant gene. Two parents who are...
• 15M.1.HL.TZ1.10: The feather colour of a certain breed of chicken is controlled by codominant alleles. A cross...
• 15M.2.HL.TZ2.4a: Define linked genes.
• 15M.1.HL.TZ2.27: What was an aim of genetic modification of organisms? A. To provide stem cells from embryos for...
• 13M.2.SL.TZ1.7c: Explain how males inherit hemophilia and how females can become carriers for the condition.
• 13M.2.SL.TZ2.5b: Outline the use of named enzymes in gene transfer using plasmids.
• 13M.1.SL.TZ1.17: In guinea pigs black coat colour is dominant to white. In a test cross between a black and a...
• 11M.1.HL.TZ1.13: A new allele that provides herbicide resistance is identified in soybean plants. The allele is...
• 11M.1.SL.TZ2.18: A human cell has between 20 000 and 25 000 genes whereas an E. coli cell has approximately 4000...
• 11M.1.SL.TZ2.19: In the following diagram, which pair represents homologous chromosomes? A. 1 and 2 B. 3 and 4...
• 12M.1.HL.TZ1.12: What makes gene transfer between species possible? A. All species use the same genetic code. B....
• 12M.1.HL.TZ2.12: What is meiosis? A. Division of a diploid nucleus to form diploid nuclei B. Reduction division...
• 12M.1.SL.TZ2.15: What is amplified using the polymerase chain reaction (PCR)? A. Large amounts of RNA B. Small...
• 12M.1.SL.TZ1.15: Which of his grandparents must be a carrier if none of them had the disease? A. Maternal...
• 09M.1.HL.TZ1.11: Red-green colour blindness is a sex-linked condition. Which of the following always shows normal...
• 09M.2.SL.TZ1.7b: Outline a basic technique for gene transfer.
• 09M.2.SL.TZ1.8b: Describe the role of sex chromosomes in the control of gender and inheritance of hemophilia.
• 09M.2.SL.TZ2.2c: Outline some of the outcomes of the sequencing of the human genome.
• 09M.2.SL.TZ2.6c: Explain the consequences of altering a DNA base in the genome of an organism.
• 10M.2.SL.TZ1.4a: Gene transfer to bacteria often involves small circles of DNA into which genes can be inserted....
• 11N.1.HL.TZ0.18: In humans a V-shaped hair line is dominant to a straight hair line. A woman with a V-shaped hair...
• 10N.2.SL.TZ0.1c: Deduce the general relationship between the growth of all the japonica varieties and their stated...
• 09N.2.SL.TZ0.7c: Using a named example, discuss the benefits and harmful effects of genetic modification.
• 13N.1.SL.TZ0.13: Which genotypes are possible when a male with blood group AB and a female with blood group O have...
• 13N.2.SL.TZ0.4a: (i)  State the technique used to collect cells for pre-natal...
• 13N.2.HL.TZ0.2a: Analyse this karyotype.
• 09N.1.SL.TZ0.15: A small amount of a suspect’s DNA is obtained from a crime scene. What techniques would be used...
• 09N.1.HL.TZ0.14: What type of enzyme could be used to cut a DNA molecule as indicated by the dotted line on the...
• 16M.2.HL.TZ0.1c: Describe the reason for testing for insulin mRNA in the embryonic stem cell cultures.
• 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
• 17M.2.SL.TZ1.5c: Explain benefits and risks of using genetically modified crops for the environment and also for...
• 17N.1.SL.TZ0.15: HindIII is an endonuclease that recognizes the sequence A A G C T T, cutting between the two...
• 17N.3.HL.TZ0.03b: Some regions of DNA act as telomeres or produce tRNA. State one other function of DNA sequences...
• 15M.1.SL.TZ2.12: If a man with blood group O and a woman with blood group AB have children, which blood group(s)...
• 15M.2.SL.TZ2.6b: Following fertilization, cells in the developing embryo differentiate. Outline a technique for...
• 13M.2.SL.TZ1.4c: Explain how sexual reproduction can allow evolution to occur.
• 13M.1.SL.TZ2.15: The image shows a human karyotype. According to the image, what conditions can be...
• 11M.1.SL.TZ1.14: Which of the following statements about homologous chromosomes is correct? A. Each gene is at...
• 11M.1.SL.TZ2.24: A parent organism of unknown genotype is mated in a test cross. Half of the offspring have the...
• 09M.1.HL.TZ1.13: What evidence is given in the pedigree chart below to prove that the condition is caused by a...
• 09M.2.SL.TZ1.1b: Outline the effects of the three species of stem borer on Bt maize type A.
• 09M.1.SL.TZ2.27: If an organism that is homozygous recessive for a trait is crossed with a heterozygote, what is...
• 10M.1.SL.TZ1.16: Which processes involved in cloning an animal are indicated by the letters X and Y?
• 10M.2.SL.TZ1.4b: The diagram below shows a cut circle of DNA into which a gene is being inserted. Before it can be...
• 11N.1.SL.TZ0.14: Which statement is a definition of a gene? A. The whole of the genetic information of an...
• 11N.1.SL.TZ0.15: Which of the following statements relate(s) to Down syndrome (trisomy 21)? I. It can be detected...
• 12N.2.SL.TZ0.4c: Using a Punnett grid, determine the possible genotypes and phenotypes of a cross between a man...
• 12N.1.SL.TZ0.13: What is the name given to a heritable factor which controls a specific characteristic? A. Allele...
• 10N.2.SL.TZ0.1a(i): State which group of rice plants were the shortest at the beginning of the experiment.
• 15N.1.SL.TZ0.15: In a human with type A blood, what determines the blood group? A. Sex chromosomes B. One or two...
• 15N.1.HL.TZ0.14: How are enzymes used during gene transfer involving plasmids?
• 13N.1.SL.TZ0.14: The following shows a pedigree chart. What type of inheritance is shown in this pedigree...
• 13N.1.SL.TZ0.16: The flow chart summarizes methods of gene transfer. Which enzymes are used in steps I and II?
• 09N.1.SL.TZ0.11: What is the cause of sickle-cell anemia?A. A change to the base sequence of a hemoglobin geneB....
• 09N.1.HL.TZ0.15: What does therapeutic cloning involve? A. Developing genetically identical cultures of human...
• 16M.1.HL.TZ0.17: What is characteristic of homologous chromosomes? A. They have an identical DNA sequence.B. They...
• 16N.1.HL.TZ0.13: What description is matched with the correct phase in meiosis I?
• 17M.1.SL.TZ2.13: What distinguishes an allele from a gene? A. An allele is made of RNA. B. An allele is...
• 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive system....
• 15M.1.HL.TZ1.14: Which process can be used to amplify small fragments of DNA?A. Gel electrophoresisB. Polymerase...
• 15M.2.SL.TZ2.1a: State the district where there is the highest number of villages with the highest incidence of...
• 15M.2.SL.TZ2.1g: Discuss whether malaria could be reduced by replacing farmland with natural ecosystems and...
• 15M.2.SL.TZ2.6a: Meiosis in humans produces cells that participate in fertilization. Outline the processes...
• 15M.2.SL.TZ1.6c: Explain the inheritance of colour blindness.
• 13M.1.HL.TZ1.13: In humans the ABO blood groups are an example of inheritance involving multiple alleles. In a...
• 13M.1.HL.TZ2.13: The diagram shows a pedigree. According to the pedigree shown, which pattern of inheritance is...
• 13M.1.HL.TZ2.14: If a father with A-type blood and a mother with B-type blood have a child, what is the...
• 13M.2.SL.TZ2.2a (ii): State two alleles in blood groups that are codominant.
• 13M.1.SL.TZ1.15: Which of the following involves meiosis? A. Tissue repairB. Production of gametesC. Asexual...
• 11M.1.HL.TZ1.12: Which of the following statements about homologous chromosomes is correct? A. Each gene is at...
• 12M.1.HL.TZ2.34: What causes genetic variety in the formation of gametes during meiosis? A. Crossing over in...
• 09M.2.HL.TZ1.1g: Compare the biomass of microbes in the soils surrounding the roots of Bt maize and non-Bt maize.
• 09M.1.HL.TZ1.12: In a cross between red haired cattle and white haired cattle the offspring produced are always a...
• 09M.2.SL.TZ1.1f: Evaluate the use of Bt maize as a food source compared to the other diets tested.
• 09M.1.HL.TZ2.22: What could be achieved by DNA profiling using gel electrophoresis? A. The chromosome number of...
• 10M.2.HL.TZ1.3b: State the stage of meiosis of a cell if it contains pairs of chromosomes as shown in the diagram.
• 10M.1.SL.TZ1.13: In some people, hemoglobin always contains the amino acid valine in place of a glutamic acid at...
• 10M.1.SL.TZ1.15: What are homologous chromosomes? A. Identical chromosomes B. Non-identical chromosomes with...
• 10M.1.SL.TZ2.13: Which of the following is the cause of sickle-cell anemia? A. Tryptophan is replaced by leucine....
• 10M.1.SL.TZ2.14: What does the karyogram below correspond to? A. A normal male B. A normal female C. A female...
• 10M.1.HL.TZ1.13: Which of the following genotypes is possible in the offspring of a homozygous male with blood...
• 11N.2.SL.TZ0.4a (ii): Deduce the genotype of the mother of person 2.
• 12N.1.HL.TZ0.9: What stage of meiosis is shown in the micrograph? A. Prophase IB. Metaphase IIC. Anaphase IID....
• 12N.1.SL.TZ0.14: What would be the expected result if a woman carrier for colour blindness and a colour blind man...
• 09N.2.SL.TZ0.4c: Explain how sexual reproduction can lead to variation in a species.
• 09N.2.SL.TZ0.7b: Describe a technique used for gene transfer.
• 15N.1.SL.TZ0.17: Laboratory analysis of DNA from a 40 000 year old woolly mammoth used the polymerase chain...
• 15N.2.SL.TZ0.3d(ii): Describe ABO blood groups as an example of codominance.
• 16N.2.SL.TZ0.4a: State the haploid number for horses.
• 16N.2.HL.TZ0.5b: Identify the genotype of the individual marked with a star in the pedigree chart, using...
• 17M.1.SL.TZ2.16: The diagram shows a pedigree of cystic fibrosis, in which the black colour indicates the presence...
• 17M.1.SL.TZ1.13: A child has blood group A. The father of the child has blood group B. What are the possible...
• 17M.1.SL.TZ2.15: Some breeds of dogs are characterized by the presence of a melanistic mask, which is a darkening...
• 17M.2.HL.TZ1.1e: Outline the additional evidence provided by the gel electrophoresis results shown above.
• 15M.2.SL.TZ2.1c: Compare the trends in incidence of malaria for Toledo and Corozal.
• 15M.2.HL.TZ2.2b: Determine, with a reason, which male is the father of the child.
• 15M.2.HL.TZ2.3c (iv): Explain the role of the following enzymes in DNA replication.DNA ligase
• 13M.2.HL.TZ1.6c: Explain how males inherit hemophilia and how females can become carriers for  the condition.
• 13M.2.HL.TZ2.2b (i): Deduce the reason for the person developing as a female.
• 13M.1.HL.TZ1.12: What information can be concluded from the karyotype? A. The person is a normal male.B. The...
• 13M.2.SL.TZ2.2a (i): Using the table, state whether recessive, dominant and codominant alleles are expressed in...
• 11M.1.HL.TZ1.11: What is the difference between the alleles of a gene? A. Their position on the chromosome B....
• 11M.1.SL.TZ1.19: Which enzymes are needed to produce recombinant plasmids to be used in gene transfer? A. DNA...
• 11M.1.SL.TZ2.26: Rhesus factor is an antigen present on the surface of red blood cells of Rhesus positive...
• 11M.1.SL.TZ2.16: How is the polymerase chain reaction (PCR) used? A. To make many copies of a DNA molecule B. To...
• 12M.1.SL.TZ2.16: What is a plasmid? A. Chloroplast DNA B. Mitochondrial DNA C. Small circle of DNA that can...
• 12M.2.SL.TZ2.6b: A small DNA sample found at a crime scene can be used in an investigation. Describe the steps...
• 09M.2.HL.TZ1.1e: Comment on the use of Bt maize as a food source compared to the other diets tested.
• 09M.1.SL.TZ1.17: Which process is used in polymerase chain reaction (PCR)? A. Transcription B. Translation C....
• 10M.2.HL.TZ1.3d: State the pattern of inheritance shown by the three genes.
• 10M.1.SL.TZ1.17: What type of inheritance is shown in this pedigree chart? A. X-linked dominant B. Y-linked...
• 10M.2.SL.TZ1.4c: Discuss the potential benefit and possible harm of one named example of gene transfer between...
• 11N.2.SL.TZ0.4b: Suggest how sheep could be genetically modified to help the treatment of hemophilia in humans.
• 12N.2.HL.TZ0.5c: Explain how meiosis results in an effectively infinite genetic variety of gametes.
• 12N.2.SL.TZ0.4b: Explain how a base substitution mutation, such as GAG to GTG, can lead to a disease like...
• 10N.2.SL.TZ0.1a(ii): Calculate the percentage change in height for the O. sativa japonica unmodified variety during...
• 15N.1.SL.TZ0.12: In a person who is heterozygous for sickle-cell anemia, where is the mutation found? A. In every...
• 15N.2.SL.TZ0.3d(i): Deduce the possible phenotypes of individual X.
• 13N.2.HL.TZ0.2b: Outline the inheritance of hemophilia in humans.
• 09N.1.SL.TZ0.14: Boys can inherit the recessive allele (c) that causes red-green colour blindness from their...
• 16M.1.SL.TZ0.14: It is possible for two parents to have children with each of the four ABO blood groups. What...
• 16M.1.SL.TZ0.16: Which technique separates proteins according to size? A. Treatment with restriction...
• 16M.1.HL.TZ0.7:  Which sequence of DNA would be suitable in DNA profiling? A. ---ATTCGTGAATCAGCC--B....
• 16M.1.HL.TZ0.20: What is the effect of dominant alleles? I. They mask the effect of recessive alleles.  II. They...
• 16M.1.HL.TZ0.18: What event occurs only in meiosis? A. Fusion of gametes to promote genetic variationB. Random...
• 16N.2.SL.TZ0.4d: A mule was born at the University of Idaho in the USA with 64 chromosomes. Suggest a mechanism by...
• 16M.2.HL.TZ0.1j: Using the data from all three studies, evaluate the use of embryonic stem cells as a treatment...
• 17M.1.SL.TZ2.14: Which is a characteristic of the pairs of sister chromatids that are visible during meiosis? A....
• 17M.2.SL.TZ2.4a.ii: Identify one type of gene mutation.
• 17M.1.HL.TZ2.17: Which is a characteristic of the haploid number of eukaryotic chromosomes? A. It doubles in...
• 17M.2.HL.TZ1.7a: Discuss the role of genes and chromosomes in determining individual and shared character features...
• 17N.1.SL.TZ0.16: An allele for lactase persistence allows humans to digest milk as adults. People who lack this...
• 17N.2.SL.TZ0.06c: Outline natural methods of cloning in some eukaryotes.
• 15M.1.HL.TZ1.12: What maximum number of different genotypes and phenotypes are possible among the children of a...
• 15M.2.SL.TZ2.1b: Analyse the data in the map to find whether there is an association between rivers and the...
• 15M.2.HL.TZ2.4b: In cats, the allele for curled ears (C) is dominant over the allele for normal ears (c). The...
• 15M.2.SL.TZ1.6b: Describe the application of DNA profiling to determine paternity.
• 15M.2.HL.TZ1.5c: Outline outcomes of the human genome project.    
• 13M.1.HL.TZ1.11: What term describes the failure of sister chromatids to separate during anaphase II? A. Sex...
• 13M.1.HL.TZ2.12: Which genetic condition can be diagnosed by karyotyping? A. Trisomy 21B. Sickle-cell anemiaC....
• 13M.1.SL.TZ2.17: The diagram shows results of electrophoresis of DNA from a crime scene. Which suspect could be...
• 11M.2.HL.TZ2.7c: Explain the causes of sickle-cell anemia.
• 11M.1.SL.TZ1.18: A woman who is a carrier for hemophilia and a man who does not have hemophilia have a child. What...
• 11M.1.SL.TZ2.25: Rhesus factor is an antigen present on the surface of red blood cells of Rhesus positive...
• 12M.1.SL.TZ2.23: The Punnett grid shows the inheritance of blood groups. What is the ratio of phenotypes of the...
• 12M.1.SL.TZ2.14: Which is a feature of sex-linked genes in humans? A. Males can only be heterozygous for the...
• 09M.2.HL.TZ1.1c: Calculate the change in mean mass of male and of female rats fed on Bt maize from day 14 to 42.
• 09M.2.SL.TZ1.1a (i): State what would be used as the control in this experiment.
• 09M.1.HL.TZ2.40: Which of the following is an inherited disease that is due to a base substitution mutation in a...
• 10M.2.HL.TZ2.4b (i): Label the diagram below which shows a basic gene transfer. I....
• 10M.1.HL.TZ2.13: What does the universal nature of the genetic code allow? A. Change of genetic code in the same...
• 11N.2.HL.TZ0.7 b: Compare the genetic material of prokaryotes and eukaryotes.
• 11N.2.SL.TZ0.4a (i): Determine the genotype of person 1.
• 12N.2.HL.TZ0.5a: Distinguish between autosomes and sex chromosomes in humans.
• 12N.1.SL.TZ0.15: In peas, tall is dominant to dwarf. In a cross between a dwarf plant and a heterozygous tall...
• 10N.2.SL.TZ0.2d: Explain, using one example, how non-disjunction in meiosis can lead to changes in chromosome number.
• 15N.1.SL.TZ0.16: A colour blind man and a woman carrier for colour blindness have a son. What is the probability...
• 15N.1.HL.TZ0.11: In a person who is heterozygous for sickle-cell anemia, where is the mutation found? A. In every...
• 15N.2.SL.TZ0.3c(i): Distinguish between the terms genotype and phenotype.
• 15N.2.SL.TZ0.5b: Outline a technique used for gene transfer.
• 13N.1.SL.TZ0.15: What happens to DNA fragments in electrophoresis?A. They move in a magnetic field and are...
• 09N.1.SL.TZ0.16: The Human Genome Project allowed the first accurate estimates of the number of different genes in...
• 16N.2.SL.TZ0.4b: Explain reasons that mules cannot reproduce.
• 17M.1.SL.TZ1.16: During which phase of the first division of meiosis can non-disjunction take place and what...
• 17M.1.HL.TZ2.21: Which is a possible risk associated with a genetic modification of crops? A. Crop plants will...
• 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
• 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
• 15M.1.SL.TZ2.18: What causes the presence of three chromosomes 21 in Down syndrome?A. Crossing overB. Allele...
• 15M.2.HL.TZ2.2a: State the name of the process used to produce the pattern of bands seen in the image.
• 15M.2.HL.TZ2.7c: Using a named example of a genetically modified crop, discuss the specific ethical issues of its...
• 15M.1.HL.TZ2.26: What is a definition of a clone? A. A group of cells derived from a single parent cellB....
• 11M.1.HL.TZ1.14: The pedigree chart below shows the blood types of three members of a family. Which could be...
• 11M.1.SL.TZ1.17: Which of the following types of information are needed to construct a karyotype? I. Size of the...
• 12M.2.HL.TZ1.6c: Explain the use of karyotyping in human genetics.
• 12M.2.HL.TZ1.6b: Outline a technique of gene transfer resulting in genetically modified organisms.
• 12M.1.HL.TZ1.11: The sequence of the first six amino acids of the normal β hemoglobin (HbA) chain are...
• 12M.2.SL.TZ1.6c: Explain the use of karyotyping in human genetics.
• 12M.1.SL.TZ2.12: What is a gene mutation? A. Failure of chromosome pairs to separate properly during cell...
• 12M.1.SL.TZ2.13: Which is a source of chromosomes for pre-natal diagnosis of abnormalities by karyotyping? A....
• 12M.1.SL.TZ1.14: If there are 16 chromosomes in a cell that is about to divide, what will be the number of...
• 09M.2.HL.TZ1.1h: The researchers’ original hypothesis stated that microorganisms would be negatively affected by...
• 09M.1.HL.TZ1.14: What conclusion can be made from the following evidence from an analysis of DNA...
• 09M.1.HL.TZ2.12: What do all human males inherit from their mother? I. An X chromosome  II. A Y chromosome  III....
• 09M.1.HL.TZ2.39: What can be concluded from the karyotype provided? A. There was non-disjunction during meiosis...
• 09M.1.SL.TZ1.14: What is the set of alleles that an individual possesses? A. A gene B. A genotype C. A genome D....
• 10M.2.HL.TZ2.4a: Explain why carriers of sex-linked (X-linked) genes must be heterozygous.
• 10M.2.HL.TZ2.4b (ii): State two general types of enzymes used in gene transfer.
• 10M.2.SL.TZ2.3b: List the possible genotypes for blood group B.
• 11N.2.HL.TZ0.3 a: Predict the genotypic and phenotypic ratios of the possible offspring of a male hemophiliac and a...
• 11N.1.HL.TZ0.20: Which technique causes fragments of DNA to move in an electric field? A. Polymerase chain...
• 12N.2.HL.TZ0.5b: Describe the inheritance of hemophilia including an example using a Punnett grid.
• 12N.1.HL.TZ0.11: When genes are transferred between species, the amino acid sequence of the polypeptide translated...
• 12N.1.HL.TZ0.10: What commonly causes Down syndrome in humans? A. Non-disjunctionB. Base substitutionC....
• 15N.1.SL.TZ0.14: What is the chromosome number in a human gamete with non-disjunction? A. 46 B. 45 C. 24 D. 23
• 15N.2.SL.TZ0.3c(ii): Outline a structural difference between the chromosomes of Helicobacter pylori and Homo sapiens.
• 09N.1.SL.TZ0.12: During reproduction in flowering plants an embryo sac is produced, containing one haploid...
• 16N.1.SL.TZ0.14: The diploid number of chromosomes in humans (Homo sapiens) is 46 and the diploid number of...
• 16N.2.HL.TZ0.5a: Using the pedigree chart, deduce the type of allele that causes hypophosphatemia.
• 17M.1.SL.TZ1.14: The micrographs show four different phases from meiosis II. What is the correct order? A....
• 17M.1.HL.TZ1.11: What proves that the inheritance of the condition shown in this pedigree chart is autosomal...
• 17N.2.SL.TZ0.02c: State an application of plasmids in biotechnology.