Chapter 11: 11.1 Chromosome Deletions, Duplications, and Inversions

Question 1

Gene duplication

Answer 1

Leads to the production of new genetic information over time and involves the duplication of a region of DNA containing one or more genes

Question 2

What can gene duplication be a result of?

Answer 2

Unequal crossing-over during meiosis

Question 3

What does gene duplication result in?

Answer 3

Two copies of the same gene
* One can mutate and change function while the other retains the original function

Question 4

Gene deletions

Answer 4

When an entire gene is deleted from a chromosome

Question 5

Chromosome inversions

Answer 5

When a segment of DNA is cut out of the chromosome and then repair mechanisms reattach it
* Sometimes reattached backwards, leads to inversions

Question 6

What will result from chromosome inversions?

Answer 6

Chromosome will no longer undergo normal crossing over at the inverted area

Question 7

Why will inverted portions of genes not undergo normal crossing over?

Answer 7

The inverted portion will not match up with its homologous chromosome

Question 8

Due to chromosome inversions, what can result from this?

Answer 8

Result in the genes within the inverted region always being inherited as a group

Question 9

Can inverted chromosomes pair up with its homologous chromosome during recombination?

Answer 9

There may be an additional mechanism that can create a loop in order to properly pair up