Sex Linked Inheritance Quick Review

Sex-linked Traits are found on the Sex Chromosomes

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Sex-Linked Traits

​Sex-linked Traits are shown as a Superscript on the X or Y.

Sex-Linked Traits

​ 1. Write out XX or XY

2. Add in trait to the X only

3. Fill out punnett square as normal.

How to show Punnett Square

Multiple Choice

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

• X^C Y^C

• X^c Y^c

• X^C Y

• X^cY

Multiple Choice

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

• X^BX^b
• X^bX^b
• X^bY
• X^BY

Multiple Choice

What would the genotype be of a colorblind male?

• X^CY

• X^CY^c

• X^cY

• X^cY^c

Multiple Choice

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 Y ?

• male with white eyes

• female with white eyes

• male with red eyes

• female with red eyes

Multiple Choice

The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?

• 0%

• 25%

• 50%

• 100%

Multiple Choice

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

Multiple Choice

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

• X^HX^h
• X^hX^h
• X^HY
• X^hY