Meiosis
- Created by: EleanorRose.
- Created on: 09-02-15 11:55
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- Meiosis
- 2 gametes fuse together to created a new offspring
- Haploid number is the amount of chromosomes from one gamete
- in humans this is 23
- Meiosis involves 2 nuclear divisions
- In the first division the homologous chromosomes pair up and their chromatids wrap around each other
- Portions of the chromatids exchange i.e. crossing over
- At the end of this stage the homologous pairs separate and one chromosome from each pair goes into 2 daughter cells
- In the second stage the chromatids move apart, at the end of this stage there are 4 cells formed i.e. 4 haploids
- In the first division the homologous chromosomes pair up and their chromatids wrap around each other
- Independent segregation of homologous chromosomes
- Each chromosome lines up with its homologous pair, one of each pair passes into daughter cell, which one depends on how they are lined up.
- Genetic combonations
- Alleles in genes may differ
- Random distribution and independent assortments result in new genetic combinations
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