formation of female gamete embryo sac development
DESCRIPTION
Meiosis 4 Haploid Cells are made 3 die and 1 surviveTRANSCRIPT
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Formation of Female Gamete
Embryo Sac Development
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Cells of Carpel Sac are 2n
• Cell in Ovule divide by Meiosis and it becomes the embryo sac or Megaspore
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Meiosis
• 4 Haploid Cells are made
• 3 die and 1 survive
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Cell Division• Mitosis
• Mitosis
• Mitosis
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8 Nuclei
• The Embryo Sac swells and now contains 8 nuclei
• This is also called the Megaspore
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Nuclei in Embryo Sac
• Polar Nuclei and Egg Cell survive
• Other Nuclei die
Egg Cell
2 Polar Nuclei
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Double Fertilisation• 1 male gamete from the pollen
grain fuses with the egg nucleus to form the embryo plant• Polar Nuclei join with the 2nd Cell
form pollen grain to form Endosperm
Fertilised Ovule = SeedIntegument = Testa
No water needed
Adaptation to life on land