In: Biology
In Drosophila , a recessive autosomal allele, ebony (e) produces a black body colour when homozygous. Another recessive autosomal allele, black (b) also produces a black body colour when homozygous. Wild type flies are grey. Flies with genotypes e/e b+/-, e+/- b/b, and e/e b/b show identical colour phenotype.
If e/e b+/b+ ebony flies are crossed with e+/e+ b/b black flies than;
c) What phenotypic ratios would be observed from the crosses F1 x true-breeding ebony, and F1 x true-breeding black?
d) What would be the effect on the F2 if the F1 were also heterozygous at a suppressor locus (su-e) that could reverse the effect of the ebony mutation in su-e homozygotes.