Question: Sickle cell anemia and albinism are both recessive traits in humans. Imagine that a couple, alrea…

Sickle cell anemia and albinism are both recessive traits in
humans. Imagine that a couple, already pregnant with twins, has
just learned that they are both heterozygous for both of these
traits. As the couple’s genetic counselor, the couple asks you the
following questions about how their carrier status will affect
their offspring. If the couple has fraternal twins, what is the
probability of having two phenotypically normal children, one being
a carrier of only the sickle cell anemia recessive allele, and the
other being a carrier of only the recessive allele for albinism?
(Hint: You will need to use both the product law and the sum law to
answer this question.)