Unit 10.4

Question 1

What is nondisjunction?

Answer 1

when a pair of homologous chromosomes or sister chromotids don’t properly seperate

Question 2

What is trisomy?

Answer 2

when there is an extra copy of a chromosome - three instead of two

Question 3

What is monosomy?

Answer 3

when there is a missing chromosome - one instead of two

Question 4

What are sex chromosomes?

Answer 4

the chromosomes that determine the sex of the person

Question 5

What are autosomes?

Answer 5

the chromosomes besides the sex chromosomes

Question 6

What is a barr body?

Answer 6

a condensed and inactivated X chromosome

Question 7

What is deletion?

Answer 7

when a section of a chromosome is missing or deleted

Question 8

What is duplication?

Answer 8

when an extra copy of a section of a chromosome is present

Question 9

What is inversion?

Answer 9

when a section of a chromosome is flipped / reversed

Question 10

What is translocation?

Answer 10

when a section of one chromosome breaks off and attaches onto another chromosome