Question

In a deletion-mapping experiment, an individual homozygous aa is crossed to an individual that is heterozygous for a deletion. The progeny of this cross all have the wild-type phenotype. What can be concluded from this cross about the location of gene A?

Answer 1

In a deletion-mapping experiment, if all offspring have the wild-type phenotype after crossing an individual homozygous aa with an individual heterozygous for a deletion, it can be concluded that gene A is located within the deleted region.

Step-by-step explanation:

In a deletion-mapping experiment, if an individual homozygous aa is crossed with an individual that is heterozygous for a deletion, and all the progeny have the wild-type phenotype, it can be concluded that the gene A is located within the deleted region. This is because if gene A was not within the deletion, the heterozygous individual would still produce some offspring with the deletion and therefore display a mutant phenotype. Since all the offspring have the wild-type phenotype, it suggests that gene A is deleted in the individual being crossed.