crossing over of chromatids

• During prophase 1 of 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 a different combination of alleles

  
• The crossing over of chromatids in meiosis 1 means that each of the four daughter cells formed from meiosis 2 contain chromatids with different alleles
• crossing over in meiosis

  A) meiosis 1

  B) meiosis 2

  C) prophase 1

  D) chromatid

  E) alleles

  F) genetic variation