Alex had two black rats (dominant). he allowed his black rats to mate and was shocked to see that three of the rat babies were black and one was an albino! what genotypes were the parents?

In order for the off springs to have a 3:1 ratio, the parents must have been heterozygous. Both blacks rats must have carried the dominant allele and a recessive allele.

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation:

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion