Holsteins being black and white is dominant over being red and white what what are the chances of a homozygous dominant for a heterozygous cow having a calf that is red

25 % chance of homozygous dominant of white calf that is red.

Explanation:

dominant traits = black and white BBWW

recessive trait = red and white  bbWw

cross between the heterozygous cows

        bW      bw

bW  bbWW bbWw

bw  bbWw  bbww

There will be 25 % chance of homozygous dominant of white calf that is red also.

when two calves that are white and red and heterozygous for the red and white trait mated they produce a phenotype ratio of 3:1 and genotype ratio of 1:2:1. Out of total progeny in punnet square 75% are red and white calves while 25% are red and but no white colour on the skin.

It shows one of the allele in white gene is recessive trait.

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