Question

1. A unique type of fox was discovered. It has a very shiny grey coat. In an attempt to figure out how this trait is inherited, a series of grey fox matings were analyzed. The resulting offspring were:

75 grey foxes

39 white foxes

37 black foxes

a) What is the mode of inheritance of coat coloration among these foxes? Explain how you determined your answer.

b) Draw a Punnett square for these crosses (between grey foxes) and indicate the genotypic and phenotypic percentages of the offspring.

Answer 1

(a) Mode of inheritance is incomplete dominance. In Incomplete dominance the phenotype of the heterozygous genotype is distinct from and often intermediate to the phenotypes of the homozygous genotypes. In this case, silver foxes are heterozygous while white and black foxes are homozygous for white and black allele respectively.

b)