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Lecture 65

BIOL 1010 Lecture 65: Lecture 65

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University of Manitoba
Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

o78P Bio 1010 - Within the ovary are egg-producing structures called ovules. Each ovule contains one developing egg and other cells that support the egg. 22.11 Development of pollen and ovule culminate in fertilization *diagram on page 482* The life cycle of plants are characterized by an alternation of generations, in which haploid(n) and diploid (2n) generations take turns producing each other. Haploid refers to a cell having a single set of chromosomes, while diploid refers to cells having two sets. In your body, all your cells are diploid except for your gametes (sperm or eggs), which are haploid. root, stems, leaves and most of the reproductive structures are diploid.
- There are specific names for these generations: the haploid generation is called the gametophyte and the diploid generation is the sporophyte.
- Within the diploid sporophyte, cells in the anther undergo meiosis. The result is haploid cells called spores.
- Each spore undergoes mitosis to form gametes (a pollen grain). This is the sperm-containing gametophyte. (contains the tube cell, and generative cell)
- Cells within the ovule also undergo meiosis to produce spores. One of these spores multiples by mitosis to form an embryo sac. This is the egg-containing gametophyte.
- The gam
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