Chapter 12 MEIOSIS

Chapter 12 MEIOSIS - Chapter12MEIOSIS Sex Meiosis*A type of...

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Chapter 12     MEIOSIS Sex Meiosis *A type of nuclear division *Meiosis is also called reduction division because it results in the production of daughter cells with only *1 set of chromosomes (the parent cells has 2 sets). Meiosis - Reduction Division *Eukaryotic cells are diploid (have 2n chromosomes). *Mitosis (asexual reproduction) produces diploid daughter cells. *Sexual reproduction involves the fusion of 2 gametes = fertilization, to produce a zygote . If the gametes each have 2n chromosomes then the zygote would have ? *Preservation of karyotype (number and physical properties of chromosomes) is essential to survival of organism. *Solution:? Ploidy Changes during the Life Cycle of a Dog *All of our cells are diploid, 2n chromosomes. Those not destined to become gametes are called somatic (body) cells, those destined to produce gametes are called germ cells. *NOTE: Germ cells go through the cell cycle too. *But why not just reproduce like bacteria?? Meiosis *Meiosis is similar to mitosis but differs in 4 ways: *Meiosis has 1 round of duplication of DNA; 2 rounds of nuclear division
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This note was uploaded on 09/08/2011 for the course BIOL 1403 taught by Professor Dini during the Fall '09 term at Texas Tech.

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Chapter 12 MEIOSIS - Chapter12MEIOSIS Sex Meiosis*A type of...

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