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 of the following sets of genes will be found in the most-common gametes produced by this cockroach?A. bu+ cv+B. bu cvC. bu+ buD cv+ cvE. bu cv+

Answer 1

E. bu cv+

Step-by-step explanation:

Given, that bu+ and cv+ are dominant alleles whereas bu and cv are recessive alleles of the respective genes. In repulsion, the chromosome has one dominant and one recessive allele of the linked genes. According to it, if the German cockroach has bu+bu cv+cv genotype, it should be present in bu+cv/bucv+ arrangement. Thus the parental gametes from this genotype would be bu+cv and bucv+. Recombinant gametes will be bucv and bu+cv+.

Since parental gametes are produced more in number than recombinant gametes in linkage, bu+cv and bucv+ will be the most common gametes. Hence, out of the given options bucv+ set of genes will be present in the most common gametes produced by this cockroach.