Inheritance Pattern in German Cockroaches

Understanding the Inheritance Pattern in German Cockroaches

German cockroaches have certain traits that are inherited based on specific genes. In this case, bulging eyes (bu) are recessive to normal eyes (bu+), and curved wings (cv) are recessive to straight wings (cv+). Both of these traits are controlled by autosomal genes that are linked.

Now, let's consider a specific scenario where a cockroach has the genotype bu+ bu cv+ cv, and the genes are in repulsion. This means that the chromosome has one dominant allele and one recessive allele of the linked genes.

Question:

Which of the following sets 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:

E. bu cv+

Explanation: Given the information provided, where bu+ and cv+ are dominant alleles and bu and cv are recessive alleles, in repulsion, the chromosome has one dominant and one recessive allele of the linked genes.

Therefore, in this scenario, the most common gametes produced by the German cockroach with the genotype bu+ bu cv+ cv would be bu+cv and bucv+. This is because parental gametes are produced more in number than recombinant gametes in linkage.

As a result, the set of genes bu cv+ will be present in the most common gametes produced by this cockroach.

Which traits are recessive in German cockroaches?

The recessive traits in German cockroaches are bulging eyes (bu) and curved wings (cv).