Question

A Drosophila female is of the cis configuration for all pairs of the three genes (st+.e+.ss+/ ). She is mated with a triple homozygous recessive male ( ). How many different phenotypes will be exhibited by the progeny? Which phenotypes will be the most abundant, intermediate, and least abundant?

Answer 1

In this cross, there will be 8 different phenotypes exhibited by the progeny. The most abundant phenotypes will have dominant alleles for all three genes, while the least abundant phenotypes will have recessive alleles for all three genes.

Step-by-step explanation:

In this cross between a Drosophila female of the cis configuration for all three genes (st+.e+.ss+/) and a triple homozygous recessive male, there will be 8 different phenotypes exhibited by the progeny. These phenotypes include stony (st+), ebony (e+), and singed (ss+) in various combinations. The most abundant phenotypes will be the ones that have dominant alleles for all three genes (st+ e+ ss+), while the least abundant phenotypes will be the ones that have recessive alleles for all three genes (st e ss).