10.4 Study Guide Flashcards
1
Q
What is the definition of nondisjunction?
A
Chromosomes that don’t separate correctly during meiosis.
2
Q
What is a barr body?
A
A gene that is turned off.
3
Q
What is trisomy?
A
When a cell is diploiid except it has 3 copies of one chromosome.
3
Q
What is monosomy?
A
When a cell is diploid except it has only 1 copy of one chromosome.
4
Q
What happens in inversion?
A
The order of a group of alleles is reversed (Ex: ABC to ACB)
5
Q
When can nondisjunction happen in meiosis 1?
A
When homologous chromosomes fail to separate.
6
Q
When can nondisjuction happen in meiosis 2?
A
When sister chromatids fail to separate.
