Sex-Linked Traits

Which of the following genotypes shows a CARRIER for a trait?

• X^BX^b

• X^bX^b

• X^BX^B

• X^bY

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

• X^N Y^N

• Xⁿ Yⁿ

• X^N Y

• Xⁿ Y

A gene that is located on 1 of the first 44 chromosomes is called _____.

• autosomal

• x-linked

• dominant

• recessive

Which of the following genotypes belongs in the red box in the Punnett square?

• X^BX^b
• X^bX^b
• X^bY
• X^BY

The sex of a child is determined by

• whether the father's sperm contains an x or y chromosome

• whether the mother's egg contains an x or y chromosome

• the age of the parents

• whether the mother's egg contains an xx or xy

Which best explains why males cannot be carriers of X-linked traits?

• Males only have one X chromosome

• Males have two copies of the X chromosome

• Males can be heterozygous for a particular trait

• Males do not have an X chromosome

What is an autosome?

• A chromosome that determines sex

• Any chromosome that is not a sex chromosome

• A single-stranded chromosome

• A chromosome found only in males

Which gender has an X and a Y chromosome?

• male

• female

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X ^R X ^r ?

• male with white eyes

• female with red eyes

• male with red eyes

• female with white eyes

Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?

• X^HX^h
• X^hX^h
• X^HX^H
• X^hY