lecture6 - CHROMOSOMES AND CELL DIVISION The human life...

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CHROMOSOMES AND CELL DIVISION
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The human life cycle • In humans, like all sexually reproducing organisms, two complementary processes must take place: • MEIOSIS and FERTILIZATION • Meiosis reduces the chromosome number in the production of sperm and eggs, and fertilization joins sperm and egg to restore the proper chromosome number. • Also, after fertilization, MITOSIS allows growth from a zygote to a mature human.
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CELL DIVISION Focus on chromosomal behavior • Eukaryotic, adult organisms have a diploid (2n) chromosome number • This means that they have two haploid (n) sets, one of which they received from each parent. Homologous chromosome or homologs are the two members of a pair of the same type (e.g., you got one chromosome #1 from mom, and one from dad) • In sexually reproducing organisms, there are two types of cell division: MITOSIS and MEIOSIS
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Mitosis and Meiosis • MITOSIS occurs in somatic (body) cells, and results in the formation of two genetically identical
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This note was uploaded on 09/23/2009 for the course BIO 150 taught by Professor Schmidt during the Spring '08 term at SUNY Stony Brook.

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lecture6 - CHROMOSOMES AND CELL DIVISION The human life...

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