Unit 2-Lesson 4

Question 1

What are the errors that can occur during meiosis?

Answer 1

Changes in chromsome structure
Changes in chromosome number

Question 2

When can errors occur during meiosis?

Answer 2

Crossing Over
Independent Assortment

Question 3

What are the 4 types of changes in a chromosome structure?

Answer 3

Translocation
Deletion
Duplication
Inversion

Question 4

What happens during translocation?

Answer 4

Segment of one chromosome becomes attached to a different chromosome

Question 5

What happens during duplication?

Answer 5

A section of a chromosome appears two or more times in a row

Question 6

What happens during deletion?

Answer 6

A piece of the chromosome is deleted

Question 7

What happens during inversion?

Answer 7

A section of chromosome is inverted

Question 8

What is Non-disjunction?

Answer 8

Non-disjunction isthe failure of the chromosomes to separate

Question 9

When can Non-disjunction happen during meiosis?

Answer 9

Non-disjunction can occur when homologous chromosome or sister chromatids do not separate during anaphase I or II of meiosis

Question 10

How can Non-disjunction affect meiosis I?

Answer 10

Homologous chromosome fail to separate

Question 11

How can Non-disjunction affect meiosis II?

Answer 11

Sister chromatids fail to separate

Question 12

What is Monosomy?

Answer 12

missing one chromosome (2n=45)

Question 13

What is Trisomy?

Answer 13

one extra chromosome (2n=47)

Question 14

List the 3 main autosomal Conditions?

Answer 14

• Trisomy 21: Down Syndrome
• Trisomy 18: Edward Syndrome
• Trisomy 13: Patau Syndrome

Question 15

List the 4 sex chromosome conditions/syndroms

Answer 15

• XXY: Klinefelter Syndrome
• XYY: Jacobs Syndrome
• XXX: Triple X Syndrome
• XO: Turner Syndrome