Sex-linked Inheritance

Sex-linked Traits are found on the Sex Chromosomes

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Sex-Linked Traits

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X and Y are ​​

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chromosomes. Females are ​

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and males are ​

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.

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

Sex-Linked Traits

Multiple Choice

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

Which genotype shows a female fly with white eyes?

• $$X^{R^{ }}X^r$$

• $$X^RX^R$$

• $$X^rX^r$$

Multiple Choice

Which genotype shows a male with white eyes?

R = Red, r= white

• $$X^rY$$

• $$X^RY$$

Match

Match the following. H= no hemophilia, h = hemophilia

• Male without hemophilia

• Female with hemophilia

• Female Carrier

• Male with hemophilia

• Female who is NOT a carrier

X^HY

X^hX^h

X^H X^h

X^hY

X^HX^H

• X^HY

• X^hX^h

• X^H X^h

• X^hY

• X^HX^H

​ 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

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

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

• X^H X^H

• X^h X^H

• X^H Y

• X^h Y

Draw

Show punnett square for X^rX^r crossed with X^RY

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

Draw

Hemophilia (h) is recessive. Draw a punnett square for X^hX^h with X^HY

Multiple Choice

What is the likelihood of this cross have a child that is colorblind?

• 100%

• 75%

• 50%

• 25%

Multiple Choice

What is the chance that a daughter will be colorblind?

• 100%

• 50%

• 25%

• 0%

Multiple Choice

What chance will a boy will be colorblind?

• 100%

• 50%

• 25%

• 0%

Multiple Choice

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

• Males

• Females

• Both males and females

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​

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are more likely to have an x-linked trait because males have only ​

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X chromosome. Females can be ​

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of an X-linked trait because they can be ​

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for the trait since they have ​

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X's.

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