Question

In German cockroaches, bulging eyes, bu, are recessive to normal eyes, bu+, and curved wings, cv, are recessive to straight wings, cv+. Both traits are encoded by autosomal genes that are linked. A cockroach has genotype bu+ bu cv+ cv, and the genes are in repulsion. Which set of genes will be found in the most common gametes produced by this cockroach?
(A) bu+ cv+
(B) bu cv
(C) bu+ bu
(D) cv+ cv
(E) bu cv+

Answer 1

Answer:

(E) bu cv+

Explanation:

Linkage is the phenomena in which two genes present on same chromosome have a tendency to get inherited together.

It is given that the two autosomal genes are linked and in repulsion. This means that the dominant allele of one gene is linked to the recessive allele of another gene and vice versa.

Hence, the parental type gametes will have bu cv+ and bu+ cv combination. Since in linkage parental gametes always appear in higher numbers than recombinant gametes, out of the given options bu cv+ set of genes will be present in most gametes produced by this cockroach.