Lecture 15

Lecture 15 - Lecture 15 Plant Reproduction and Development...

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Lecture 15 Plant Reproduction and Development Angiosperm life cycles o Dominant form is diploid o In flowers, meiosis occurs Flower parts o Sepals, usually green o Petals – radial symmetry o Stamens (male) Anthers Filaments o Carpels (female) Stigmas – sticky top part to catch pollen Styles – long tube Ovary – contains ovules or eggs Plants and pollination o Pollination and fertilization are not the same o Pollen carries the sperm Pollen: from anther Pollen grains to stigma germinates Meiosis sperm 2 sperm cells are delivered – double fertilization o Two haploid sperm cells fertilize to separate sets of female cells, one sperm will join with TWO female cells o Diploid zygote and triploid nutritive lining called the endosperm o Double fertilization Pollen tube grows to ovule, deposits 2 sperm One + egg = zygote One +2 female nuclei = 3N endosperm (nourishes the embryo) o Embryo is inside a seed (terrestrial adaptation) and ovary develops into
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This document was uploaded on 10/26/2011 for the course BIOL 101 at UNC.

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Lecture 15 - Lecture 15 Plant Reproduction and Development...

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