meiosis Flashcards
1
Q
What are the five stages of meiosis?
A
-Interphas
- Prophase
-Metaphase
- Anaphase
- Telophase
2
Q
how does variation occur in meiosis?
A
- crossing over: were nonsister chromatids become twisted during prophase 1 causing recombination
- Independent assortment: this happens during metaphase , when the chromosomes are lined up on the equator of the cell in a random arrangement, which causes the chromatids to be made of a combination of maternal and paternal chromosomes
3
Q
what is an allele?
A
a version of a genr
4
Q
what does meiosis make?
A
4 non-identical haploid cells
5
Q
what is a diploid cell?
A
a somatic cell with 46 chromosomes
6
Q
what happens in prophase?
A
The nuclear learning breaks down and DNA condenses into chromosomes
7
Q
what happens in metaphase?
A
The centrioles attach the chromosomes centrosome aligning them to the equator
8
Q
what happens in anaphase?
A
- Is it the centrioles contract, making the chromosomes split into chromatids on opposite poles of the cell
9
Q
What happens in telophase?
A
- 2 nuclear envelopes form
10
Q
what is different about meiosis 1 vs 2?
A
-in metaphase 1 the chromosome line up in pairs vs metaphase 2 where they line up singly
- in anaphase 1 whole chromosomes get pulled to poles but in anaphase 2 chromatids get pulled
