Meiosis

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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
    • 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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