Codominance In Coat Colors Of Palomino Horses 537813

D1 and D2 is a pair of codominant alleles comprised in the inheritance of coat colors in horses. Genotypes homozygous for D1 produces chestnut [reddish], heterozygous genotypes palomino (golden color with lighter shade of mane and tail) and homozygous for D2 cremello [about white].

a) Find out the probable palomino: non-palomino ratio amongst the offspring’s of palomino only mating.

b) What percentage of the non-palominos can be expected to breed true?

c) What kinds of mating would produce just palominos?