exam 4 material

exam 4 material - 12/11/2008 10:24:00 PLOIDY Chromosomes...

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Unformatted text preview: 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 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: 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 alternation of generations: a haploid phase followed by a diploid phase followed by a haploid phase Note difference between a spore and a gamete 12/11/2008 10:24:00...
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exam 4 material - 12/11/2008 10:24:00 PLOIDY Chromosomes...

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