meiosis Flashcards
1
Q
meiosis
A
4 haploid gametes are produced from one diploid cell
2
Q
interphase i
A
- DNA replication takes place in synthesis phase
- chromosomes are replicated, making pairs of sister chromatids
3
Q
prophase i
A
- homologous chromosomes pair up
- homologous pairs (bivalent)
- crossing over can take place
- results in the exchange of alleles between non-sister chromatids
4
Q
metaphase i
A
- homologous pairs align at the equator
- random orientation
5
Q
anaphase i
A
- homologous pairs separates
- reduction division
- non-disjunction can occur here
- spindle fibre contract
- centromere do not split
6
Q
telophase i
A
- new nuclei are formed
- nuclei contain pairs of sister chromatids, but no homologous pairs (bivalent)
- spindle fibre break down
- nuclear membrane reform
- cytokinesis begins
7
Q
interphase ii
A
no dna replication
8
Q
prophase ii
A
no crossing over
9
Q
metaphase ii
A
sister chromatids align at the equator
10
Q
anaphase ii
A
- centromere is split + sister chromatids are separated
- non-disjunction can occur here
11
Q
telophase ii
A
new nuclei are formed and cytokinesis begins. four haploid gamete cells are reproduced
