Any occurence of extra chromosones is due to genetic mutation/disorders.
Answer:
B. Two racehorses with desirable traits are bred to produce a superior racing horse.
Explanation:
Artificial selection is also called selective breeding. In artificial selection, two organisms having desirable characters are allowed to breed with each other in order to produce a specie having good characteristics or better from their parents in many ways. For example, two racehorses which contains desirable traits are allowed to breed to produce a better horse.
No, it cannot because codominance is the expression of both alleles coming forth from each parent. One parent would be R(A)R(A) and the other parent would be R(B)R(B). Their offspring would only be able to be R(A)R(B). They could not be homozygous.