3.2 understand that fertilisation involves the fusion of a male and female gamete to produce a zygote that undergoes cell division and develops into an embryo

  • When fertilization occurs, a male gamete fuses with a female gamete to form a zygote (unfertilized egg)
  • The zygote undergoes cell division by mitosis (reproduction of genetically identical cells)  This develops into an embryo – a ball of cells
  • Embryos contain chromosomes from  both parents, therefore receiving characteristics from both parents. Process of fertilisation is random, resulting in genetic variation
  • Gametes are haploid cells
  • Haploid cells contain 1/2 the number of chromosomes (23) instead of the full 46
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