Sex-Linked Review

Colorblindness is a sex-linked recessive disorder. A normal woman whose father was colorblind marries a man with normal color vision. What percentage of their sons will be colorblind?

• 0%
• 25%
• 50%
• 100%

Hemophilia is a sex-linked recessive disorder. A woman with hemophilia marries an unaffected man whose father had hemophilia. What percentage of their daughters will have hemophilia?

• 0%
• 25%
• 50%
• 100%

Colorblindness is a sex-linked recessive disorder. If the daughter of a couple is colorblind, what are the two possible genotypes of her mother?

• X^AX^A and X^AX^a
• X^AX^A and X^aX^a
• X^AX^a and X^aX^a
• Cannot be determined

If a trait shows up more commonly in men than women it is probably

• not inherited
• on the x chromosome and dominant
• on the x chromosome and recessive
• on a normal body chromosome

What percentage of the female offspring will be a carrier for this recessive disease?

• 0%
• 50%
• 100%
• 25%

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

Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?

• X^HX^h
• X^hX^h
• X^HY
• X^hY

Colorblindness is a recessive x-linked disorder.
Which genotype represents a male with normal vision?

• X^NX^N
• XⁿXⁿ
• X^NY
• XⁿY

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

• X^BX^b
• X^bX^b
• X^bY
• X^BY

Vitamin D resistant rickets (deformed bone formation) is a sex-linked DOMINANT trait.  According to the Punnett square, what percentage of female offspring will have the disorder?

• 0%
• 25%
• 50%
• 100%