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1116 - Lecture#3 1 bryophyta life cycle a starts with a...

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November 16, 2011 Lecture #3 1. bryophyta life cycle a) starts with a spore (n) b) spore starts to divide into a tubular structure which is multicellular c) this tube is called a protonema, where buds (source of rapid growth) form d) these buds grow vertically to produce gametophytes e) gametophytes produce gametes at their tips in megagametophyte (female), each archegonium can only produce one egg at the microgametophyte (male), produces MANY flagellated sperm within one sac when fertilization occurs, embryo is on the tip of the megagametophyte f) paraphyses—linear multicellular stalks on the tips of the gametophytes, has no egg or sperm sacs g) following fertilization, mitosis, and development, the embryo grows and remains attached to the female gametophyte h) young sporophyte growing vertical has a layer of cells surrounding and protecting it (calyptra) i) site of zygote (and hen the embryo) after fertilization j) the sporangium capsule has diploid (sporogenous) tissue 2. spore capsule a) the diploid “spore mother cells” inside the capsule undergo mitosis to produce haploid
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