Sex-linked Punnett Squares

The following are examples of sex-linked disorders except:

• Hemophilia

• Sickle cell anemia

• Color Blindess

• Diabetes

Sex-linked disorder is defined as a disorder in which the allele that is responsible for producing the disorder is found on a sex chromosome.

• True

• False

A female would be colorblind (XⁿXⁿ) only if

• only father is colorblind

• only mother is colorblind

• mother is a carrier and father is normal

• mother is a carrier and father is colorblind

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

X linked recessive gene is ___.

• always expressed in male

• always expressed in female

• lethal

• sub lethal

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 X ^r ?

• male with white eyes

• female with red eyes

• male with red eyes

• female with white eyes

Tags

NGSS.HS-LS3-1

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

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the genotype of a white eyed, male fly?

• X ^R X ^r

• X ^R X ^R

• X^r X ^r

• X ^r Y

• X^R Y

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

H= normal blood clotting

h=hemophilia

X^HX^h x X^HY

What is the probability that any of their offspring will have hemophilia?

• 4/4

• 3/4

• 2/4

• 1/4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

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

• 0%
• 50%
• 100%
• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

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

• X^BX^b
• X^bX^b
• X^bY
• X^BY

Tags

NGSS.HS-LS3-1