A farmer bred two horses. One had a homozygous genotype and had white hair, the other had a homozygous genotype and had black hair. The resulting offspring had a roan coat, with both white and black furs showing equally. What is the explanation for how the offspring had the roan coat?(1 point)

Question

Responses

The alleles must show incomplete dominance.
The alleles must show incomplete dominance.
The allele for white hair must be completely dominant to the the allele for black hair.
The allele for white hair must be completely dominant to the the allele for black hair.
The allele for white hair must be codominant with the allele for black hair.
The allele for white hair must be codominant with the allele for black hair.
The allele for roan hair is found on the X chromosome and therefore is a sex linked trait.

Answer 1

The correct explanation for how the offspring had the roan coat, with both white and black furs showing equally, is:

The allele for white hair must be codominant with the allele for black hair.

In codominance, both alleles express themselves fully and independently in the phenotype, resulting in a mixture where both traits are visible, like the roan coat in this case.