08-07a Sex-Linked Traits

What percentage of the offspring will have this recessive disease?

• 0%
• 25%
• 50%
• 75%

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

• 0%
• 50%
• 100%
• 25%

If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?

• sex-linked trait
• polygenic trait
• codominant trait
• incomplete dominance trait

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

• X^HX^h
• X^hX^h
• X^HY
• X^hY

What is the genotype of a white-eyed, male fruit fly?

• X^RX^r

• X^RX^R

• X^rX^r

• X^rY

• X^RY

X^B X^B is crossed with X^b Y.

What proportion/percent of the male children are colorblind?

• 100%

• 75%

• 25%

• 0%

A woman with the genotype X^BX^b has a child with a man with the genotype X^BY.

What proportion of the male children are colorblind?

• 100%

• 75%

• 50%

• 25%

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. 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%

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.