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exam 4 material

exam 4 material - 10:24:00 PLOIDY...

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12/11/2008 10:24:00 PLOIDY         Chromosomes that carry genes for the same traits (eye color, hair color etc.) are  the same length and  have their centromere in the same location.  These chromosomes are called  homologues, or a  homologous pair.                             Haploid                            diploid                            tetraploid     Homologous Chromosomes:  Chomosomes containig the same genes  MEIOSIS:              Meiosis results in haploid nuclei being formed from diploid nuclei.                          Often called a "reductional division"                Typically during sexual reproduction in a diploid organism two haploid  cells fuse restoring the  diploid condition.                In an organism each of the haploid cells must contain one chromosome  from each chromosome 
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pair, otherwise the resulting cell would be missing some genes.    Meiosis also consists of 2 separate divisions                                                              Meiosis I                                                              Meiosis II      Phases of Meiosis:              As I go through this process pay attention to how the process produces  haploid nuclei and  divides the chromosomes such that each resulting cell has one  chromosome  from each pair.                 Prophase I:                            Synapsis                           tetrad                          Crossing-over                  Metaphase I:                  Anaphase I:                  Telophase I:  
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               Cytokinesis:                               Segregation : Homologues separate into different cells                            *  Independent Assortment : Different pairs assort independently    Interkinesis                  Prophase II Metaphase II:                  Anaphase II:                  Telophase II:                  Cytokinesis  now occurs again, may be equal or unequal      LIFE CYCLES 
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            alternation of generations:                a haploid phase followed by a diploid phase followed by a haploid phase    Note difference between a spore and a gamete 
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  • Fall '07
  • Wishtichusen
  • Biology, R/R Y/Y                                   r/r, Y/Y                                   r/r y/y

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