2.3 Errors In Meiosis

Question 1

What are the two processes of Meiosis that can lead to Errors?

Answer 1

Independent Assortment: When chromosomes line up
Crossing over: The exchange of DNA segments

Question 3

What is the name of the condition that causes gametes to have an abnormal amount of chromosomes

Answer 3

Aneuploidy

Question 4

What is non-disjunction?

Answer 4

When sister chromatids don’t separate in anaphase 1 or 2

Question 6

What is the condition caused by missing a chromosome?

Answer 6

Monosomy

Question 7

What is the condition that causes an extra chromosome?

Answer 7

Polysomy

Question 8

What does down syndrome result in?

Answer 8

3 copies of chromosome 21 instead of 2

Question 9

What are the 4 ways that chromosomes can have an abnormal structure during crossing over?

Answer 9

Deletion, Duplication, Inversion, Translocation

Question 10

What occurs in translocation?

Answer 10

The gene attaches to a non-homologous chromosome (ex. Chromosome 2 attaches to chromosome 10)

Question 11

What occurs in Inversion?

Answer 11

The gene attaches to a homologous chromosome but in opposite order (top w the others bottom)

Question 12

What happens in Duplication?

Answer 12

A gene attaches to a complete chromosome and results in duplicated section.

Question 13

What happens in Deletion?

Answer 13

The gene (piece of chromosome) fails to attach and gets lost