Question

If a red cow (homozygous dominant ) is crossed with a white cow (homozygous dominant ) , what alleles will the offspring have

Answer 1

Your cow will be red or light red

Answer 2

Assuming you actually meant homozygous dominant for the white cow, the alleles of the offspring would be:

RW

Where R stands for the allele that codes for the color red and W stands for the allele that codes for the color white.