Lecture 101 Meiosis CHIU 2008.ppt

Lecture 101 Meiosis CHIU 2008.ppt - C h i-h u a C h iu D e...

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Chi-hua Chiu Dept. of Genetics Office Hours: Tuesdays, 12:45-1:45 Douglass Campus MSLC Copy of important figures (not in your book) and lecture guide will be on reserve at the MSLC.
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Meiosis [and Mitosis] Chapter 10
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2n=46 2n=46 2n=46 Mitosis The genetic purpose of mitosis is to produce two daughter Cells that are genetically identical to the parent. Mitosis occurs in somatic cells. Cells can be haploid (n), diploid (2n) or polyploid.
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Meiosis 2n=46 n=23 n=23 n=23 n=23 M1 M2 The genetic purpose of meoisis is to produce four haploid (n) cells that are each genetically different from the parent cell. Starting point is the zygote, fusion of two parental cells (2n) Meiosis produces germ cells, the oocyte and sperm.
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DNA in cell is packaged in chromosomes.
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Centromeres and Telomeres
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Homologous chromosomes 22 pairs of autosomes 1 pair of sex chromosomes 2N=46 (diploid) Homologous?
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Centrioles (duplicated in S phase)
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Spindle fibers
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Metaphase Plate
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Cytokinesis (separation of cytoplasm to form two daughters)
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Homologous vs. Sister Chromatids Homologous chromatids Sister chromatids Sister chromatids are a result of the duplication of chromosomes during S phase Sister chromatids contain identical DNA sequences Homologous chromatids are a result of obtaining one set of
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Lecture 101 Meiosis CHIU 2008.ppt - C h i-h u a C h iu D e...

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