Bio 111 - Lecture 10

Bio 111 - Lecture 10 - Biology 111 Lecture 9 - Seed Plants...

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Biology 111 Lecture 9 - Seed Plants October 10, 2007 Chapter 29 pgs. 584–588 Chapters 30, 35, 36 - memorize the fern life cycle (sexual, alternation of generations) - sporophyte is the spore making plant - gametophytes don " t last as long as sporophyte. sporophyte is perennial - syngamy = fusion of sperm and egg - sporophyte = diploid mitosis - gametophyte = haploid. always haploid. the only diploid is the zygote - young leaves = fronds - sorus = cluster of sporangia = site of meiosis - mitosis serves to build the gametophyte - rhizoids = stem like tissue (anchor the fern down, gather moisture) but no vascular tissue = the GAMETOPHYTE produces GAMETES - sporophyte is dependent on gametophyte for growth
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Again, ask yourself these questions. - Where would mitosis occur? - Is it haploid or diploid mitosis? - What is the Frst cell of the diploid generation? - What is the Frst cell of the haploid generation? - Which things are diploid and which are haploid? Sporophyte - the spore plant Gametophyte - the gamete plant I. Characteristics of Seed Bearing Vascular Plants A. Same as Seedless Vascular Plants in Some Ways - dominant independent sporophyte - stems, leaves (megaphylls), and roots - megaphyll = larger leaves that have a greater photosynthetic area - vascular tissue of xylem and phloem - small gametophytes B. Differ From Seedless Vascular Plants in Some Ways - Gametophytes are even smaller - microscopic - female gametophyte occurs inside the baby seed - ovule : a baby seed - male gametophyte is a pollen grain - Sperm doe not swim - travels with (inside) the male gametophyte - goes farther than swimming/splashing sperm - Dependent Gametophyte - megagametophyte (female) remains on sporophyte - dependent on sporophyte for nutritional and physical support - produced in megasporangia - microgametophyte (male) transported by the wind, water, or animals - dependent on sporophyte only part of the time (young) - produced in microsporangia - All are heterosporous : different kinds of spores
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Bio 111 - Lecture 10 - Biology 111 Lecture 9 - Seed Plants...

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