Genetic variation

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Daisy

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Cards (8)

  • When do chromatids cross over?
    Meiosis 1
  • What happens in meiosis 1?
    Homologous pairs of chromosomes come together and PAIR UP
    • The CHROMATIDS twist around each other and bits of CHROMATIDS SWAP OVER
    • The chromatids still contain the same genes but now have different COMBINATION OF ALLELES
  • What are the 2 main events during meiosis that lead to genetic variation?
    Crossing over of chromatids
    Independent segregation of chromosomes
  • What does the crossing over of chromatids in meiosis 1 mean?
    that each of the 4 daughter cells formed from meiosis contains chromatids with different alleles
  • (crossing over) what does each cell produced from meiosis have?
    A different chromatid and therefore a different set of alleles , which increases genetic variation