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DP IB Biology: SL

Topic Questions

Home / IB / Biology: SL / DP / Topic Questions / 3. Genetics / 3.3 Inheritance / Multiple Choice: Paper 1


3.3 Inheritance

Question 1

Marks: 1

Which rows correctly describe monohybrid crosses that follow Mendel's principles of inheritance?

  Cross Predicted outcome
I A pure-breeding parent with dominant alleles is crossed with a pure-breeding parent with recessive alleles. All of the offspring will have the same characteristic as the dominant parent
II A plant which is heterozygous dominant for a trait is crossed with a plant that is homozygous recessive.    Equal 1:1 ratio of offspring with either phenotype exhibited by the parent.
III Pure breeding parents that have co-dominant alleles are crossed.

Equal proportions of offspring with a characteristic of either of the parents.

IV Two parents that are heterozygous dominant are crossed Three times as many offspring have the dominant phenotype (3:1 ratio).
  • I and II only.

  • I, II and IV.

  • I and IV only.

  • II, III and IV.

Choose your answer
  

Question 2

Marks: 1

The pedigree chart below shows the inheritance of Tay-Sachs disease which is an autosomal recessive trait, characterised by neurological problems caused by the death of nerve cells. 

In the pedigree chart, a filled in circle or square means the individual is affected and shows the genetic condition.

What is the probability that individuals 3 and 4 will have another child with Tay-Sachs disease?

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  • 25%

  • 50%

  • 75%

  • 100%

Choose your answer
  
Key Concepts
Pedigree Charts

Question 3

Marks: 1

Which statements best explain why the ABO blood system in humans is an example of co-dominance?

  1. Allele IA and the allele IB are both expressed in the heterozygote/AB type blood.
  2. Neither allele IA or the allele IB can mask the expression of the other allele.
  3. There are three alleles of the gene that controls the blood group.
  4. There are more than two blood groups.

  • All of them.

  • I. II. and III.

  • I. and II.  

  • II. and III.

Choose your answer
  

Question 4

Marks: 1

Two parents with normal factor VIII have a child with haemophilia.

Which is the correct statement?

  • The mother is normal but the father carries the defective gene.

  • Both parents are carriers for the defective gene.

  • Only the mother is a carrier for the defective gene.

  • The child must have been female.

Choose your answer
  

Question 5

Marks: 1

Which statements best explain why a significant increase in the incidence of cancer was reported following the nuclear bombing of Hiroshima and Nagasaki, and the nuclear accident of Chernobyl?

I. Ionising radiation can induce breaks in the DNA structure.

II. Control of the cell cycle can be affected by mutagens.  

III. Mutations were passed down to offspring leading to increased cancer rates. 

IV. Mutations arise when the body repairs a break in the DNA structure. 

  • I, II and III.

  • I, II, and IV.

  • I, III and IV.

  • I, II, III and IV.

Choose your answer