BY5.3 Gamete Development and Fertilisation

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Pollen formation:

  • diplod pollen grains undergo meiosis to from haploid cells
  • each cell develops into a pollen grain which has a thin inner wall (an intine) and a thick outer wall (an exine)
  • when the pollen grain is ripe, the outer laters of he anther dry out and curl away to expose the pollen grain


Female gamete formation:

  • the megaspore mother cell divides mitotically to produce a row of 2 haploid cells (megapsores)
  • 3 megapsores degenerate, 1 grows
  • enalrged one developes into a mature embryo sac
  • nucleus divides mitotically to…


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