Sex Linked Traits Review

Males have _______ sex chromosomes

• XX

• XY

• X

• y

Which of the following is the correct description for this genotype?

• male with white eyes

• female with red eyes

• male with red eyes

• female with white eyes

Females have _____ sex chromosomes

• XY

• x

• XX

• Y

In fruit flies, eye color is a sex-linked trait.  Red (R) is dominant to white (r).

What genotype would be correct for a female fly with white eyes

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Which of the following genotypes is a carrier for hemophilia

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Which of the following is true

• Males can be carriers for hemophilia

• Females cannot have hemophilia

• Males cannot be carriers for hemophilia because it is an X linked disorder and someone must have a heterozygous genotype to be a carrier (XHXh)

• Females are only carriers of hemophilia

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The following punnett square depicts the x-linked cross of a female who carries hemophilia with a man showing no symptoms. Fill in the genotype represented by the blank box in the punnett square.

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Who is more likely to have an X-linked trait?

• Males

• Females

• Both males and females

Males have how many X chromosomes?

• 1

• 0

• 2