CH 9 - CH.9.meiosisandsexualreproduction Objectives:

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CH. 9. meiosis and sexual reproduction    Objectives :     1.     Contrast asexual and sexual types of reproduction that occur on the cellular and multicellular          organism levels. 2.     Understand the effect that meiosis has on chromosome number. 3.     Describe the events that occur in each meiotic phase. 4.     Understand the basic steps in the development of male and female gametes. 5.     Understand sources of genetic variation as they relate to meiosis. 6.     Describe similarities and differences between mitosis and meiosis.     Key Terms : asexual reproduction genes clones sexual reproduction gametes allele meiosis chromosome number diploid number homologous chromosomes germ cells haploid number centromere sister chromatids spindle apparatus meiosis I meiosis II prophase I crossing over nonsister chromatids genetic recombination metaphase I maternal chromosomes paternal chromosomes spores sporophytes gametophyte
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primary spermatocyte sperm oocyte polar body ovum egg fertilization Lecture Outline :                   Impacts, Issues: Why Sex?            A.   Asexual reproduction is quick and efficient.                   1.   Asexual reproduction does not require the participation of a partner.                   2.   But the offspring are all clones—no variation!            B.   Sexual reproduction is most costly.                   1.   Male and female partners must find each other and exchange genetic material.                   2.   The variation introduced by sex has selective advantages.          9.1.      Introducing Alleles            A.   In asexual reproduction, one parent passes a duplicate of its genes (DNA molecules) to its  offspring, which can only be genetically identical clones of the parent.            B.   In sexual reproduction, each parent contributes one gene for each trait.                   1.   Genes for each trait come in slightly different forms called alleles, originally produced  by mutations.                    2.    Meiosis   shuffles   the   alleles   during   gamete   formation,   and   fertilization   produces 
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This note was uploaded on 12/21/2010 for the course BIO 03 taught by Professor Garcia during the Fall '08 term at Los Angeles City College.

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CH 9 - CH.9.meiosisandsexualreproduction Objectives:

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