In fruit flies, a mutation in the ken and barbie gene results in flies lacking e

Question

In fruit flies, a mutation in the ken and barbie gene results in flies lacking external genitalia. A mutation in the vestigial gene results in flies with shriveled wings. ken is the mutant version of the

ken and barbie gene and ken+ is the normal version of the gene. vg is the mutant version of the vestigial gene and vg+ is the normal version of the gene. The genitalia defects associated with mutations in the ken and barbie gene and the shriveled wings associated with mutations in the vestigial gene are both inherited in an autosomal recessive manner. Which of the following fly genotypes should result in a phenotypically wild-type fly?

A. ken+ vg+/ken vg

B ken vg+/ken+ vg

C Both genotypes==>Answer is both but I do not know why

D. Neither genotype

Explanation / Answer

Answer

A. ken+ vg+/ken vg

Since the mutant ken and barbie gene (lack of external genetalia) and mutant vestigial gene (shriveled wings) are recessive but inherited, the wild type genotype would option A.

For reference look in to the Punnette below:

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