Ch13Top10 - Meiosis is a two-step process consisting of meiosis I and meiosis II Results in 4 haploid daughter cells meiosis I divides into haploid

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Chapter 13 KEY CONCEPTS Offspring acquire genes from parents through inheriting chromosomes Asexual reproduction involves one parent producing genetically identical offspring through mitosis Sexual reproduction provides genetically diverse offspring produced from two parents The normal cell is diploid or 2n, after undergoing meiosis, the cell becomes haploid with only a single chromosome for each giving it half the number. (Humans: 46-23) Union of gametes (called fertilization) results in a zygote (fertilized egg) containing both parents genetic information and becomes diploid from the two haploid cells. Sexual reproduction and genetic variation provide information/ material for evolution by natural selection and adaptation.
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Unformatted text preview: Meiosis is a two-step process consisting of meiosis I and meiosis II. Results in 4 haploid daughter cells, meiosis I divides into haploid and meiosis II replicates similar to mitosis. Genetic Variation Independent assortment: because each homologous pair of chromosomes is independent at meiosis I, assortment is random. Gives a greater number of possible outcomes for daughter cell. Crossing over: produces recombinant chromosomes that combine genes from both parents, during prophase I, non-sister chromatids of homologous chromosomes exchange corresponding segments. Random fertilization: random nature of fertilization adds to genetic variation....
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This note was uploaded on 10/30/2009 for the course SI 0126 taught by Professor Gourney during the Spring '09 term at École Normale Supérieure.

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