Week 4 Notes

Haploid n sexual reproducon diploid 2n antheridium

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Unformatted text preview: volu;onary Trend from Haploid to Diploid 25 1/27/14 Trends •  The sporophyte is small in bryophytes, larger in ferns, and dominant in gymnosperms and angiosperms. The male gametophyte of seed plants is reduced to a microscopic structure called a pollen grain. •  The gametophyte in seed plants is dependent on the sporophyte •  Seed plants can produce two dis;nct types of spores and spore- producing structures—a development known as heterospory. Some Vascular Plants Evolved Separate Male and Female Gametophytes •  Homosporous plants produce 1 type of spore –  Gametophytes bisexual (sperm and eggs) –  Mo;le sperm require liquid water •  Heterosporous plants produce 2 types of spores –  Female gametophyte produces eggs, site of fer;liza;on –  Male gametophyte (pollen grain) nonmo;le sperm transfer into female gametophyte 26 1/27/14 Plant Diversity Through Time Embryophytes Bryophytes non- vascular plants •  Special structures that enclose the gametes 27 1/27/14 What is the importance? Bry...
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This note was uploaded on 04/07/2014 for the course LS 1 taught by Professor Thomas during the Winter '05 term at UCLA.

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