BB lecture 1-21-09 life cycles & meiosis

BB lecture 1-21-09 life cycles & meiosis - Chapter...

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Chapter 13 – Life cycles and meiosis Learning objectives • Differentiate between asexual and sexual reproduction. • Be able to diagram the three types of life cycles of animals, plants, and fungi. • Understand why meiosis is essential to sexual reproduction. • Be able to demonstrate how meiosis differs from mitosis. • Know what crossing over involves and when it occurs. • Explain how meiosis leads to increased genetic variation. • Know what kinds of cells undergo mitosis; what kind undergo meiosis. Terms to know include…tetrad, reduction division, chiasmata, haploid, diploid, genes, gametes, zygote, alternation of generations, synapsis, sporophyte, gametophyte…
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Sea grasses…asexual reproduction Sea grasses…sexual reproduction
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Comparing Asexual and Sexual Reproduction In asexual reproduction, one parent produces genetically identical offspring by mitosis In sexual reproduction, two parents give rise to offspring that have of genes inherited from each parent unique combinations
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Diploid multicellular organism Key MEIOSIS FERTILIZATION MEIOSIS FERTILIZATION MEIOSIS FERTILIZATION n n n n n n n n n n n n n 2n 2n 2n 2n 2n Zygote Gametes Haploid multicellular organism (gametophyte) Haploid multicellular organism Haploid Diploid Mitosis Mitosis Spores Gametes Mitosis Mitosis Gametes Mitosis Zygote Zygote Mitosis (a) Animals Diploid multicellular organism (sporophyte) (b) Plants and some algae (c) Most fungi and some protists Figure 13.6 Three types of sexual life cycles
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Interphase and meiosis I
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This note was uploaded on 02/26/2009 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas at Austin.

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BB lecture 1-21-09 life cycles & meiosis - Chapter...

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