Figure 13.1
-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:
(a)Is the mutant allele for yellow body recessive or dominant?
(b)Is the yellow locus autosomal (not X-linked)or X-linked?

Question

Quizplus · Accepted Answer

This cross shows that in the F₁ generation, all offspring were wild type, indicating that the wild type allele is dominant. In the F₂ generation, both wild type and yellow-bodied flies were observed, indicating that the yellow allele is recessive. Additionally, since the cross involves both male and female flies and does not follow patterns of inheritance seen with sex-linked traits, we can conclude that the yellow locus is autosomal, not X-linked.

Figure 13.1 -In a Drosophila Experiment,a Cross Was Made Between Homozygous Wild-Type