A cross was made between homozygous wild-type female Drosophila and yellow-bodie

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:

Sex                              Phenotype                   Number

Male                             wild                             96

Male                             yellow                         99

Female             wild                             197

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?

Explanation / Answer

a)
Recessive
Since only single population of Drosophilia flies carry the yellow locus genes

b)
X-chromosme
Males have these genes and we can see all of female flies are wildtype color.

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