-In a Drosophila experiment,a cross was made between homozygous wild-type females and yellow-bodied males.All of the resulting F₁s were phenotypically wild type.However,adult flies of the F₂ generation (resulting from matings of the F₁s)had the characteristics shown in the figure above.Consider the following questions:
(a)Is the mutant allele for yellow body recessive or dominant?
(b)Is the yellow locus autosomal or X-linked?

Question

Quizplus · Accepted Answer

The mutant allele for yellow body is recessive because the F1s were all phenotypically wild type, indicating that the wild-type allele is dominant. The yellow locus is X-linked because the F2 generation had a 1:1 ratio of wild-type to yellow-bodied males, indicating that the yellow allele is located on the X chromosome.

-In a Drosophila Experiment,a Cross Was Made Between Homozygous Wild-Type