Question

How do you fill in the boxes?

7.1: Dihybrid Cross in Drosophila melanogaster In this exercise we will be focusing on two genes, one of which controls wing development (ap - apterous and the other controlling body coloration (eb - ebony). Each of these genes has two alleles, where the dominant allele of each produces the wild-type phenotype for their respective trait. When expressed in the homozygous recessive genotype, the recessive allele (ap) for the apterous gene results in a wingless phenotype. When expressed in the homozygous recessive genotype, the recessive allele (eb) for the ebony gene results in an ebony-colored body phenotype. Enter ALL genotypes corresponding to each phenotype below (use Eb, eb, Ap, and ap). wild-type apterous ebebApap (ex.) ebebApap (ex.) ebebApap (ex.) ebebApap (ex.) ebebApap (ex.) ebebApap (ex.) ebony and ebony apterous ebebApap (ex.) ebebApap (ex.) ebebApap (ex.) Check Sorry, that is incorrect. Fix the highlighted box(es) and try again.

Answer 1

the possible genotypes for the wildtype are EbEbApAp, EbebApap, EbEbApap, EbebApAp. ( to get the wildtype phenotype the fly has to has a dominant allele for both locus).

possible genotypes for the apterous fly are

EbEbapap, Ebebapap ( apterous fly is homozygous recessive at the apterous locus and it has to have one dominant allele at the Ebony locus)

possible genotypes for the Ebony fly are

ebebApAp, ebebApap ( the ebony fly is homozygous recessive at the ebony locus and it has to have one dominant allele at the Ebony locus)

the genotype of the ebony and apterous fly is ebebapap.