Punnett Squares and Sex-Linked Traits (UPDATED)

The video discusses the role of platelets in blood clotting and introduces hemophilia, a sex-linked recessive disorder. It explains sex-linked traits, focusing on X and Y chromosomes, and demonstrates how to use Punnett squares to predict genetic outcomes. The video also covers the probability of genetic traits and highlights key considerations in understanding genetic disorders, including the difference between sex-linked and autosomal traits.

What is the primary function of platelets in the human body?

• To carry nutrients

• To help blood clot

• To fight infections

• To transport oxygen

Which chromosomes are referred to as sex chromosomes?

• Chromosomes 21 and 22

• X and Y chromosomes

• Chromosomes 1 and 2

• Chromosomes 5 and 6

In a Punnett square for hemophilia, what does the genotype X^HX^h represent in a female?

• A female with hemophilia

• A female without hemophilia

• A carrier female

• A male with hemophilia

What is the probability of a child being born with hemophilia if the mother is a carrier and the father does not have hemophilia?

• 0%

• 50%

• 75%

• 25%

Which of the following is more common in males due to having only one X chromosome?

• Sex-linked dominant traits

• Autosomal dominant traits

• Sex-linked recessive traits

• Autosomal recessive traits

Can a sex-linked trait be dominant?

• No, all sex-linked traits are recessive

• Yes, a sex-linked trait can be dominant

• Yes, but only in females

• No, sex-linked traits are only found in males

Which animal has a different set of sex chromosomes compared to humans?

• Cats

• Birds

• Dogs

• Elephants