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Unformatted text preview: Meiosis 06/03/2008 09:18:00 Outline • Purpose • Meiosis I o Separate homologous chromosomes • Meiosis II o Separate chromatids • Spermatogenisis • Oogenesis • 3 ways to get variation • compare meiosis with mitosis Production of the ovum and sperm Creates diversity because of certain characteristics in common with mother and father but you are not exactly the same. Male-occurs in testis Female-occurs in ovary Fig. 12.4 • Sister chromatids held together by a centromere • In meiosis we start out with two chromosomes called homologous chromosomes one from mother one from father • Homologous chromosomes are made up from one from mother and one from father they have the same info on them but in a different form • Sister chromatids are the replicated chromosomes • Nonsister chromatids have the same gene but in different forms • Two copies of each chromosome are called diploid organisms. Meiosis-go from one to four cells that contain half the amount of genetic material started with....
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- Spring '07
- sperm cells, homologous chromosomes