Marbles is a calico cat with a Manx tail. She wants to have kittens with a male calico, but can’t seem to find one. Alas, male calicos are rare;

Question 1

Marbles is a calico cat with a Manx tail. She wants to have kittens with a male calico, but can’t seem to find one. Alas, male calicos are rare; the only ones have the sex chromosome constitution XXY. Male calicos are therefore rare because ___________.

Question 2

In cattle, mahogany spots are dominant in males and recessive in females. This trait is _______.

Question 3

Plumage in chickens is of two varieties, a “hen” pattern and a “cock” pattern. They differ because the trait is sex-limited; that is, males have different feather arrangements than females. The autosomal gene H controls the trait in this manner: Henrietta is one of a flock of hens who has chicks with Boris, the lone rooster. He has tantalizingly beautiful plumage in the cock pattern. If Henrietta is genotype Hh, the probability that a male chick will have his father’s gorgeous plumage is ________.

Question 4

Microphthalmia is a condition that causes chickens to have very small eyes, but it only appears in hens. The condition is autosomal recessive. Microphthalmia is sex-influenced and not sex-limited because _______________.

Question 5

In males, genes on the X chromosome are ___________.