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Chapter10 - Chromosome number Chapter 10 Meiosis Every...

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1 Chapter 10 Meiosis Chromosome number Every organism has characteristic number of chromosomes. Humans: 46 But a baby comes from fusion of two cells, sperm and egg Chromosome reduction Gametes (sperm and eggs) need a haploid number of chromosomes (23 for humans) Fertilization restores normal diploid number Meiosis produces haploid cells Stages of Meiosis Prophase, metaphase, anaphase, telophase BUT repeated Roman numerals I and II Cytokinesis repeated also, so four haploid cells result Chromosome Pairs The 46 human chromosomes come in 23 homologous pairs Homologous means “same size and function” Chromosome 1 is the longest Chromosome 22 is the shortest Also, X and Y chromosomes
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2 Making the Pairs Haploid eggs have one of each chromosome pair The fertilizing sperm provides the other chromosomes So each pair has a maternal and a paternal chromosome Metaphase I of Meiosis It’s important that a gamete carry one chromosome 1, one chromosome 2, etc., no mix-ups During metaphase I, the chromosomes
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