Meiosis and Life Cycles - 1 We have just finished looking at the process of mitosis, a process that produces cells genetically identical to the original cell. Mitosis ensures that each cell of an organism has the same DNA as the original fertilized egg or zygote. Passing chromosomes and genetic information from generation to generation is equally important. A critical role of heredity is to maintain and obtain variation among members of a species. These variations are the result of the specific genes we inherit from our parents through sexual reproduction. However, chromosome number doesn't double with each generation. Each generation of a species has the same chromosome number as the preceding generations. Meiosis is the process that ensures that each new generation has the same chromosome number as the preceding generation. Meiosis is a process that reduces chromosome number by half and occurs at just one stage in an organism's life cycle (to form gametes in animals, or to start the gamete
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.