Fruit flies (Drosophila melanogaster) have been used in genetic cross experiments since the early 1900s. Which of the following features of fruit flies is the least good reason for choosing them for conducting genetic cross experiments?
Events in meiosis play an important role in determining the inheritance of alleles. Which row of the table states the correct words to name the processes being described?
The orientation of chromosomes pairing up in prophase I
Chromosome are pulled towards the poles of the cell in anaphase I
The inheritance pattern of two separate genes was investigated in a double-heterozygous cross in watercress plants. A chi-squared test of phenotypic ratios of the two separate genes results in a χ2 value of 3.5.
At a 5% probability level, the critical value of chi-squared is 7.8 for an experiment of this nature.
Which row of the table best describes a conclusion that can be drawn from this data?
Over time, many dihybrid cross experiments of autosomally-linked genes in sweet pea plants (Lathyrus odoratus) have been carried out by reputed scientists.
Which of the following best explains the presence of some non-parental phenotypes in the offspring of such crosses?
Crossing over has occurred, leading to the production of recombinant plants
The scientists made errors such as not cleaning the small paint brush that they used to transfer pollen grains between plants
Independent assortment was disproved by Thomas Hunt Morgan so unusual phenotypes are to be expected
Only plants of one gender exhibit the parental phenotypes due to linkage
Long hair in a species of rabbit is caused by the presence of the allele HL. These rabbits have either very long hair or moderately long hair. The 'wild-type' short-haired rabbit possesses the allele HS. The diagram below shows the results of two crosses involving one female and two male rabbits.
Which row of the table below shows the phenotypes of the rabbits with the genotypes HLHL and HLHS?