X-Linked Traits Lesson

The video explains X-linked traits, focusing on how they are inherited and expressed in humans. It covers the basics of human chromosomes, particularly the X and Y chromosomes, and their role in determining gender and other traits. The video discusses X-linked recessive traits, such as hemophilia and color blindness, and explains why these traits are more commonly expressed in males. It also provides an example of how a female carrier of an X-linked recessive trait can impact her offspring. The video concludes with a call to action to subscribe for more educational content.

What determines the gender of a child in humans?

• The size of the chromosomes

• The number of chromosomes

• The shape of the chromosomes

• The presence of X and Y chromosomes

Which chromosome carries around 200 genes?

• X chromosome

• Y chromosome

• Both X and Y chromosomes

• Neither X nor Y chromosome

How many human X-linked genes are there approximately?

• 1100

• 500

• 1500

• 200

Which of the following is NOT an X-linked recessive trait?

• Blue eyes

• Male pattern baldness

• Red-green color blindness

• Hemophilia

Why are X-linked recessive traits more commonly expressed in males?

• Males have a stronger phenotype

• Males have more dominant alleles

• Males have only one X chromosome

• Males have two X chromosomes

What happens to a recessive allele on one X chromosome in females?

• It is always expressed

• It is masked by a dominant allele on the other X chromosome

• It becomes a dominant allele

• It disappears

What is the chance of a son inheriting an X-linked recessive disorder if the mother is a carrier?

• 100%

• 75%

• 50%

• 25%

If a woman is a carrier of an X-linked recessive trait, what is the likelihood of her daughters being carriers?

• 50%

• 0%

• 100%

• 25%

What is the probability of daughters inheriting an X-linked recessive disorder if the mother is a carrier and the father is unaffected?

• 0%

• 25%

• 50%

• 100%

What is the main topic of the video?

• Y-linked traits

• Autosomal traits

• X-linked traits

• Mitochondrial traits