Genetic Traits and Punnett Squares in Hemophilia

The video tutorial explains hemophilia as an X-linked recessive trait affecting blood clotting. It explores the genetic makeup of a carrier mother and a hemophiliac father, using a Punnett square to predict the likelihood of their offspring inheriting hemophilia. The tutorial calculates the probability of having a hemophiliac daughter or son and discusses various genetic scenarios.

What type of genetic trait is hemophilia?

• Autosomal recessive

• Y-linked

• Autosomal dominant

• X-linked recessive

What does it mean for a woman to be a carrier of hemophilia?

• She has hemophilia and shows symptoms.

• She has a Y chromosome with the hemophilia allele.

• She has two X chromosomes with the hemophilia allele.

• She carries one X chromosome with the hemophilia allele but does not show symptoms.

In a Punnett square, what does the combination of an X chromosome with a hemophilia allele from both parents result in?

• A daughter without hemophilia

• A son without hemophilia

• A son with hemophilia

• A daughter with hemophilia

What is the probability that a daughter will have hemophilia if her mother is a carrier and her father is hemophiliac?

• 25%

• 50%

• 75%

• 100%

How many scenarios in the Punnett square result in a hemophiliac offspring?

• Four out of four

• One out of four

• Two out of four

• Three out of four

What is the chance of having a hemophiliac son if the mother is a carrier and the father is hemophiliac?

• 0%

• 75%

• 25%

• 50%

If a couple has a son, what is the probability that he will not have hemophilia?

• 25%

• 75%

• 50%

• 0%

What is the probability of having a non-hemophiliac son?

• 0%

• 25%

• 75%

• 50%

What is the probability of having a hemophiliac offspring?

• 25%

• 50%

• 75%

• 100%

Given that a couple has a son, what is the probability that he has hemophilia?

• 50%

• 25%

• 0%

• 75%