What would you expect to see in their offspring if you cross a yellow one with a purebred red one? what percentages would you expect in the offspring genotypically and phenotypically?

3:1.

Explanation:

If we cross a yellow one with a purebred red one, the dominant allele has the large percentage in the appearance of offspring whereas little appearance of recessive allele occurs in the offspring. The offspring has 75 percent of the traits of dominant parent in its genotype and phenotype while on the other hand, the offspring receives 25 percent of characteristics from the recessive parent. So we can say that more offspring resembles to dominant parent.

there's no big difference.

explanation:

the only little different between a rabbit and bunny is just that bunnies are much smaller than rabbits. bunnies are basically baby rabbits.