Mitosis and meiosis Flashcards
1
Q
DNA replication is driven by……. ……..
A
Pyrophosphate hydrolysis
2
Q
How many DNA molecules are there in two chromatids?
A
Two DNA molecules
3
Q
What occurs at G1?
A
Cellular contents excluding the chromosomes are duplicated
4
Q
In which stage of the cell cycle are the chromosomes duplicated?
A
S phase
5
Q
What occurs in the G2 phase?
A
The cell “double checks” the duplicated chromosomes for errors, making any needed repairs?
6
Q
What occurs in prometaphase of mitosis?
A
Spindle fibres attach to chromosomes and chromosomes condense
7
Q
What occurs at G0?
A
Cell cycle arrest
8
Q
At what steps of meiosis does variation occur?
A
Prophase 1- Crossing over
Anaphase 2- Random chromatid assortment
9
Q
Where are the cell cycle checkpoints?
A
Between G2 and M
between G1 and S
