Sex-linked notes

Multiple Choice

What is the biological sex of the person in this karyotype?

• male (XY)

• male (XX)

• female (XY)

• female (XX)

Multiple Choice

True or false: sex-linked disorders are more common in males because they only have one x chromosome.

• true

• false

Multiple Choice

¡To be affected with an X-linked genetic disorder, females must inherit a copy of the defective allele from both the mother and the father.

• True

• False

Multiple Choice

Male-pattern baldness is an X-linked recessive trait, labeled Xb, with the dominant normal hair gene being XB.  A father with the genotype XBY and a mother with the genotype XBXb have a son. What is the percent chance that the son will inherit male-pattern baldness?

• 50%

• 25%

• 100%

Hotspot

Select the daughter in the Punnett square to the right who will be a carrier for hemophilia.