bio lecture notes 4

bio lecture notes 4 - PLOIDY Chromosomes that carry genes...

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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:
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Telophase I: Cytokinesis: Segregation : Homologues separate into different cells * Independent Assortment : Different pairs assort independently
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This note was uploaded on 02/23/2011 for the course BIOL 1201 taught by Professor Wishtichusen during the Fall '07 term at LSU.

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bio lecture notes 4 - PLOIDY Chromosomes that carry genes...

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