In codominant inheritance, both alleles in a heterozygous individual are fully expressed. In this case, we have a homozygous white horse (CWCW) and a homozygous black horse (CBCB).
When these two horses are bred together, the offspring will inherit one allele from each parent:
- From the white horse: CWCW → will contribute CW
- From the black horse: CBCB → will contribute CB
The genotype of all offspring will be CWCW × CBCB = CWCBCW.
Since the parents are both homozygous and the interaction between the alleles is codominant, the offspring will express both traits (white and black) and will therefore be roan, with both colors represented in their hair.
Thus, the likelihood that their offspring will be roan is:
100%
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