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Angiosperm Reproduction Chapter 38

Angiosperm Reproduction Chapter 38. Parts of a Flower. Stigma Style Ovary. Carpel/Pistil (female). Stamen (male). Anther Filament. petals. ovule. sepal. Sperm Formation. Anther contains the microsporangia Microsporangia (2N) creates 4 haploid microspores by meiosis

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Angiosperm Reproduction Chapter 38

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  1. Angiosperm ReproductionChapter 38

  2. Parts of a Flower Stigma Style Ovary Carpel/Pistil (female) Stamen (male) Anther Filament petals ovule sepal

  3. Sperm Formation Anther contains the microsporangia Microsporangia (2N) creates 4 haploid microspores by meiosis Each microspore will undergo mitosis to make a generative cell and a tube cell Generative cell goes through mitosis to create 2 sperm Pollen = male gametophyte Gametes (2 sperm) formed by gametophyte

  4. 3 Antipodal cells 2 Polar nuclei 2 synergids egg Egg Formation Megasporangia divides by meiosis to create 4 haploid megaspores 3 megaspores die Female gametophyte 3 mitotic divisions

  5. Double Fertilization of ovule Pollen containing 2 sperm and 1 tube cell 1. Tube cell creates a pollen tube down the style until it reaches the micropile 2. The 2 sperm follow the path of the tube to the egg 3. One sperm fertilizes the egg, creating a diploid zygote 4. 2nd sperm fuses with the 2 polar nuclei, creating a 3N nucleus. This divides and forms the “endosperm” = nourishment and food for the zygote 5. Ovule is now a seed; the ovary develops into a fruit

  6. Fruit assists in seed dispersal and protects the seed with the developing embryo

  7. Seed Structure plumule Monocot Seed Mono = one Cot = Cotyledon epicotyl hypocotyl One cotyledon epicotyl Radicle = embryonic root hypocotyl Dicot Seed Di = two Cot = Cotyledons (Seed Leaves) plumule Two cotyledons

  8. Radicle  Hypocotyl  Epicotyl  Plumule  Root Shoot Shoot Tip Young Leaves

  9. Germination Plumule (foliage) epicotyl Cotyledons Cotyledons hypocotyl hypocotyl Integument (Seed coat) radicle

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