Question

Question 25 2 pts In dragons, the dominant allele R causes solid tail color, and the recessive alleler results in white spots on a colored background. The black coat color allele Bis dominant to the brown allele b, but these genes can only be expressed if the animal has an mm genotype at a third gene locus. Animals that are M are yellow regardless of which allele from the Blocus is present. A mating between a solid yellow-tailed male dragon and a solid brown-tailed female dragon produces 16 offspring with the following tail phenotypes: six solid yellow, two spotted yellow, three solid black, one spotted black, three solid brown, and one spotted brown. What is the most likely genotype of the male parent? Mm Bb RR MM Bb RR Mm BB Rr MM BB RR Mm Bb Rr

Answer 1

If the male has homozogyous for M gene, there is no chance of black and brown offspring, which indiates that for gene M the male is heterozgyous. so,
for gene M: Mm

If the male has homozygous for R gene, ther is no chance of spotted offspring, as the spotted offspring and solid offspring indicates that for gene R the male is heterzygous. so,
for gene R: Rr

If the male has homozygous for B gene, ther is no chance of brown offspring, as the presence of black offspring and brown offspring indicates that for gene B the male is heterzygous. so,
for gene B: Bb.

So, the male genotype is  MmRrBb.