Meiosis involves homologous chromosomes pairing, crossing over, chiasmata formation, and the separation of homologous chromosomes and then sister chromatids to produce four haploid cells.
La meiosi comporta l'appaiamento dei cromosomi omologhi, il crossing-over, la formazione di chiasmata e la separazione dei cromosomi omologhi e poi dei cromatidi fratelli per produrre quattro cellule aploidi.
| Front | What happens in meiosis? |
|---|---|
| Back | - homologous chromosomes pair up to form bivalents - crossing over occurs - chiasmata form causing alleles to be exchanged between chromatids - new combinations of alleles in chromatids - bivalents align at equator - chromosomes in bivalent pulled to opposite poles by spindle fibre contractions - two haploid cells form - each chromosome has 2 sister chromatids - chromosomes align at equator - sister chromatids pulled to opposite poles by spindle fibre contractions - four haploid cells form |
Tags: genetics
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