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ALTERNATION OF GENERATIONS An alternation of generations occurs in all plants. The alternation is between diploid and haploid forms. Look at the generalized diagram above. Mitosis is the replication of a cell to form two daughter cells with identical sets of chromosomes. In animals, this only occurs with diploid cells. But in plants, mitosis occurs in both diploid and haploid plant forms. Meiosis, a replication event where the resulting cells end up with half the genetic material, occurs in plants, not to form gametes, but to form spores - simple haploid cells that can germinate (divide by mitosis) to form new haploid gametophytes. Mitosis occurs multiple times during a plant cycle. Meiosis occurs once , to form spores. SPOROPHYTE = spore-producing plant GAMETOPHYTE = gamete-producing plant A SPOROPHYTE (2N) produces spores (N) (through meiosis) that will divide (through mitosis) to form gametophytes. A GAMETOPHYTE (N) produces gametes (N) (through mitosis) that unite to form zygotes (2N) that divide (through mitosis) to form the sporophyte (2N)
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Four Main Groups of Plants 1. NON-VASCULAR BRYOPHYTES A. MOSSES liverworts hornworts B. Non-vascular tissue - no true leaves, roots, or stems (root-like rhizoids, NOT rhizomes)
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This note was uploaded on 11/07/2010 for the course BIO 1441 taught by Professor Dr.frederick during the Fall '10 term at UT Arlington.

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