Question

In some cattle the red and white coat color is the result of codominant alleles. Heterozygotes are called roan and have areas of red and areas of white hair. A pair of cattlehave many offspring that are all other red or roan What color are the two parents?both are roanone red the other whiteone red the other roanone roan the other whiteооооAll PreviousBackNext343 PM127/2022BIType here to search

Answer 1

In this case, we have alleles with codominance, red (R) and white (W), when one individual is red their alleles are (RR, homozygous) when is white is (WW, homozygous) meanwhile is roan is (RW, heterozygous). In the present cross, we have an offspring of roan (RW) and red (RR), which means there are no homozygous for white (WW), which led us to the conclusion that the parental cross is red (RR) x roan (RW). This can be easily confirmed with a punnet square.

R R

R RR RR

W RW RW