10) Life Cycle of Angiosperms

10) Life Cycle of Angiosperms - AP Biology Life Cycle of...

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AP Biology Life Cycle of Angiosperms 1) Generalized Life Cycle 2) What are angiosperms? a) Angiosperms = Flowering plants b) Appeared approx. 300 million years ago c) Most extant plant species d) Most diverse land plants
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3) Explanation on how this cycle works a) I start with microspores (n) and megaspores (n) Microspores: Male Gametophytes Megaspores: Female Gametophytes b) Male gametophyte exist in the pollen grains – Figure 2 Microsporocyte divides by meiosis and produces 4 haploid cells and developed into pollen grain Pollen grain = gametophyte enclosed with a pollen wall and two different types of cells significant to the reproduction: tube cell and generative cell Tube cell = A cell which contributes to making of pollen tube to the ovule Generative cell = A cell which contributes to the formation of 2 sperms and discharges to the ovule c) Female gametophyte exists in the ovary – Figure 3 In the megasporangium, megasporocyte (megaspore mother cell) undergoes meiosis (the reduction of the number of chromosomes) I would then have 4 haploid cells: 1 egg cell and 3 polar cells After undergoing three mitotic divisions of megaspore, a complete female gametophyte (embryo sac) is formed In the embryo sac (ovule) integuments surround the embryo sac. Embryo sac consists of these following elements: synergids, antipodal cells,
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10) Life Cycle of Angiosperms - AP Biology Life Cycle of...

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