Sex-Linked Inheritance

Sex-linked traits are genes inherited through the ___ chromosome.

How many chromosomes do humans have?

• 23

• 46

• 64

• 32

Tags

NGSS.HS-LS3-1

What determines biological sex based on chromosomes?

• The 21st pair of chromosomes.

• The 15th pair of chromosomes.

• The 23rd pair of chromosomes.

• The 25th pair of chromosomes.

How many chromosomes are found in each somatic (every cell that isn't a sperm or egg) cell of the human body?

• 23

• 46

• 22

• 44

Which chromosome pair determines the biological sex of an organism?

• Middle pair

• Second pair

• First pair

• Last pair

What is the role of the SRY gene?

• Coding for eye color

• Development of testes in males

• Coding for hair color

• Development of ovaries in females

Why are males more likely to have hemophilia?

• Because their Y chromosome carries the mutation.

• Because their single X chromosome can carry the mutation.

• Because they have two Y chromosomes.

• Because they have two X chromosomes.

What was the impact of hemophilia on European royalty?

• It increased the power of the royal families.

• It played a role in the downfall of the last Tsarist regime in Russia.

• It led to the discovery of the cure for hemophilia.

• It had no significant impact.

Let's talk about how biological gender is determined. We know that females are XX and males are XY. They only pass on one of these chromosomes to each offspring. Drag the correct combinations of sex chromosomes below to fill in the Punnett square.

b

a

XY

XX

Tags

NGSS.HS-LS3-1

Based on the previous question, who determines gender?

• Mom

• Dad