Question

a yellow female labrador retriever was mated with a brown male. half of the puppies were brown, and half were yellow. explain how the same female, when mated with a different brown male, could produce only brown offspring.

Answer 1

Answer:

There are two alleles, the recessive yellow allele and the dominant brown allele. The female is hom0zygous recessive while the male is heterozygous, this means that half of their children will be hom0zygous recessive and be yellow. The other half will be brown and heterozygous, meaning they have a yellow allele and a brown allele. If the female mated with a hom0zygous dominant male, then all of their offspring will end up being heterozygous and brown.