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In fruit flies, a specific gene mutation causes the wings to become malformed. These wings are called vestigial because they do not function properly. The mutated allele for vestigial wings (v) is recessive to the allele for functioning wings (V). Two fruit flies that are heterozygous for wing shape are crossed, resulting in many offspring. Which of the following would most likely describe the population of offspring? A. The majority of the offspring population has functioning wings. B. All of the offspring population have functioning wings.

Sagot :

Answer: A. The majority of the offspring population has functioning wings.

Explanation:

Since the flies are heterozygous for wing shape, their genotype would be Vv.

Therefore, the cross would be :

Vv x Vv -----> VV Vv Vv vv

From the above cross the different phenotypes associated with the progenies of the given genotype are as follows :

VV ---> functioning wings

Vv -----> functioning wings

vv----> vestigial wings

Thus, we can see that 3 out 4 progenies will have functioning wings i.e 75%

and 25% will have vestigial wings.

Thus, option A is correct.