In shorthorn cattle coat color may be red white or roan Roan

In shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate phenotype expressed as a mixture of red and white hairs. Using the table below, determine how coat color is inherited.

red x red = all red

red x white = all white

red x white = all roan

roan x roan = 1/4 red, 1/2 roan, 1/4 white

a. This is a case of co-dominance.

b. This is a case of sex-linked dominance.

c. This is a case of incomplete dominance.

d. This is a case of complete dominance

Solution

a. This is a case of co-dominance.

Explanation:

Codominance: both alleles for a gene are expressed when present.

RR X RR = RR (Red)

WW X WW =WW (white)

RR X WW =RW (Roan coat)

RW (Roan coat) x RW (Roan coat)

¼ RR, ½ RW, ¼ WW