Biology Quiz: The Genetics Of Sex

The all-important gene on the human Y chromosome that causes the gonad to develop into a testis is the gene called _______.

The number of Barr bodies that an XXX human female should have _____.

The protein made by the male-determining gene on the Y chromosome in humans is called ________.

The sex of calico or tortoise shell cat (usually) ________.

X chromosome inactivation in mammals is the mechanism by which _________ occurs.

In honeybees, fertilized eggs develop into:

• Fruit flies

• Males

• Females

• Intersex bees

• None of the above.

In fowl, the cock-feather gene is only expressed in roosters that are homozygous for that allele, so this is an example of a(n) _______ trait. (We didn't cover this one this year, 2010).

If a mutant allele behaves as a dominant allele in males but as a recessive allele in females, then this is an example of a(n) _______ trait. (We didn't cover this one this year, 2010).