Question

The roan coat color in cattle is an example of codominance. This means both alleles are clearly expressed.

Answer 1

50 % of the offspring are expected to have roan coat If two roan cattle were crossed.

Explanation:

In codominance both alleles from the parents are expressed and the phenotype is different from the parents.

Roan is a type of coat colour where there is even occurrence of coloured and white hairs on the coat of the cattle.

The genotype of Roan cattle is CRCW  (CR red, CW-white)

If two roan cattles are mated:

CRCW X CRCW

punnet square shows:

       CR       CW

CR CRCR    CWCR              the genotype ratio = 1:2:1

CW  CWCR  CWCW            phenotype ratio = 1:2:1

1  pure white cattle

1 pure red cattle

2 roan cattle