Lecture 3 review

Question 1

What are the three similarities between mendel’s factors and chromosomes?

Answer 1

Both come in pairs, each pair segregates into gametes during meiosis, and each pair assorts/aligns is independently of each other during meiosis

Question 2

What is an autosome?

Answer 2

A chromosome that doesn’t differ between males and females

Question 3

What is a sex chromosome?

Answer 3

A chromosome that differs between males and females

Question 4

The pairing of sex chromosomes occurs through a small region of homology called ______

Answer 4

the pseudoautosomal region

Question 5

What is a homogametic sex?

Answer 5

The sex in a species whose gametes are a homozygous pair (ex: XX in human females)

Question 6

What is a heterogametic sex?

Answer 6

The sex in a species whose gametes are heterozygous (ex: XY in human males)

Question 7

In humans, a male’s x chromosome linked traits are determined _______

Answer 7

solely by his mother’s genotype

Question 8

Human males are ______ for x linked traits

Answer 8

hemizygous