Lecture - Oct 21

Lecture - Oct 21 - Male and Female Gametophytes (n) fig....

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Male and Female Gametophytes (n) –fig. Really important – all the polar nuclei and the egg cells during the true fertilization process Pollination - Pollen grains are transported to stigmas by a variety of agents such as animals and wind o Self-pollination: within same flower or different flower on same individual plant Prevented by plants increasing harmful genes or rejecting its own pollen (self-incompatibility) o Cross-pollination: transfer to a flower on another individual of same species Co-evolution - Reciprocal adaptation o Flowering plant, animal pollinator form interdependent relationship affecting one another’s evolution - Example: o Flowers with large, showy petals and scent o Bees with hairy bodies that catch pollen grains Pollinating Agents1 Insects Attracted to flowers that are yellow or blue, can’t see red flower scented to attract insect e.g. rotting flesh smell so that insect associate it with where it lay eggs Stamens spring out and deposit pollen on bee Birds - Flowers yellow, orange and red (visible light range) - No strong scent since birds have no sense of smell Bats - Flowers with dusky white petals;
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Lecture - Oct 21 - Male and Female Gametophytes (n) fig....

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