8.2 Sex Determination and Sex Linkage

Question 1

Humans contain…?

Answer 1

22 pairs of Autosomes and 1 pair of Sex Chromosomes

Question 2

Women have what chromosomes?

Answer 2

2 X chromosomes

Question 3

Men have what chromosomes?

Answer 3

One X and one Y chromosome

Question 4

Sex-Linked Genes

Answer 4

Genes located on the sex chromosomes

Question 5

X-Linked

Answer 5

Located on the X chromosome

Question 6

Y-Linked

Answer 6

Located on the Y chromosome

Question 7

What is the SRY gene?

Answer 7

It leads to the development of the testes

Question 8

Who do males inherit the X from?

Answer 8

Their mothers

Question 9

Why are males more likely to express recessive X-linked traits than females?

Answer 9

Because they carry only 1 X

Question 10

Why are females less liked to express X-linked traits?

Answer 10

Because they have 2 copies of the bad X’s

Question 11

X inactivation

Answer 11

Guarantees that all females receive only 1 dose of the proteins by the X chromosome

Question 12

Is Inactivation reversible? How is it inherited?

Answer 12

Inactivation is irreversible and it is inherited during cell division when RNA begins wrapping around the X chromosome