Genetics???

Question

Assume you are studying the trait of a coat color in guinea pigs which is controlled by a single pair of alleles. A black guinea pig pig is crossed with white guinea pig. In the F1 generation, all of the offspring have black coats.

Identify the dominant allele_________

" " the recessive allele_________

" " the genotype of the F1 guinea pigs____________

Answer 1

1. If the hybrid ones are all black, then black must be dominant.
2. If black is dominant, then white must be recessive.
3. If all the offspring have black coats in the F1, then it's most likely that they are all Bb. We know the white parent was bb. It's most likely that the black parent was BB instead of Bb because none of the offspring inherited a b from the black parent.