7.5 Study Guide Flashcards
1
Q
What is nondisjunction?
A
the deletion or addition of a full sister chromatid
2
Q
What is Deletion
A
missing a gene
3
Q
What is Translocation?
A
When a gene(s) is moved from one chromosome to another chromosome.
4
Q
What is Inverse?
A
When genes are switched around on a chromosome.
5
Q
How many chromosomes do humans have?
A
23 (including sex chromosomes)
6
Q
What chromosome(s) represent the female sex?
A
XX
7
Q
What Chromosomes(s) represent the male sex?
A
XY
8
Q
What is a trisomy?
A
When there are 3 copies of one chromosome instead of 2
9
Q
What is an example of trisomy found in a genotype?
A
Down Syndrome
10
Q
What is Duplication?
A
Extra genes
11
Q
What happens during X-chromosome inactivation?
A
One X chromosome turns off and shrivels to become a Barr body. So when the cell divides it only has one working chromosome.
