Question

A cross was made between homozygous wild-type female Drosophila and yellow-bodied male Drosophila. All of the resulting offspring were phenotypically wild type. Offspring of the F2 generation had the following phenotypes:

Based on this information:
a) Is the mutant gene for yellow body behaving as a recessive or dominant?
b) Is the yellow locus on an autosome or on the X chromosome?

Answer

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