Albinism in animals is caused by recessive mutations inone of several autosomal genes required for synthesis ofmelanin, a chemical precursor for many skin and eye pigments. Albino animals are often confused with so-calledleucistic animals that are white due to recessive mutationsin a gene required in a different pathway, for example apathway for development of the cells that produce all skinpigments. Suppose you have two white hummingbirds—a male and female—and they have mated. Assuming thatall relevant mutations are rare, autosomal, and recessiveto wild-type alleles, what would you expect their progenyto look like under the following conditions:a. They are both albinos.b. They are both leucistic.c. One is albino and the other is leucistic.
Albinism in animals is caused by recessive mutations in
one of several autosomal genes required for synthesis of
melanin, a chemical precursor for many skin and eye pigments. Albino animals are often confused with so-called
leucistic animals that are white due to recessive mutations
in a gene required in a different pathway, for example a
pathway for development of the cells that produce all skin
pigments. Suppose you have two white hummingbirds—
a male and female—and they have mated. Assuming that
all relevant mutations are rare, autosomal, and recessive
to wild-type alleles, what would you expect their progeny
to look like under the following conditions:
a. They are both albinos.
b. They are both leucistic.
c. One is albino and the other is leucistic.
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