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Published byLindsay Doyle Modified over 7 years ago
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Reduction-Division Genetic Recombination 1
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cell division GAMETES, HALF CHROMOSOMES, The form of cell division by which GAMETES, with HALF the number of CHROMOSOMES, are produced. DIPLOID (2n) HAPLOID (n) MeiosisSEXUAL reproduction. Meiosis is SEXUAL reproduction. TWO divisionsMEIOSIS I MEIOSIS II TWO divisions (MEIOSIS I and MEIOSIS II). 2
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GAMETES(sperm or egg) Sex cells divide to produce GAMETES (sperm or egg). HALF Gametes have HALF the # of chromosomes. 3
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2n=46 human sex cell diploid (2n) 2n=46 Meiosis I n=23 sperm haploid (n) Meiosis II 4
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mitosis Similar to mitosis interphase. CHROMOSOMES (DNA) CHROMOSOMES (DNA) replicate chromosometwo identical SISTER CHROMATIDS CENTROMERES Each duplicated chromosome consist of two identical SISTER CHROMATIDS attached at their CENTROMERES. ONLY ONLY occurs during meiosis I 5
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Cell division chromosome number one- half. Cell division that reduces the chromosome number by one- half. Cell division Cell division in which chromosomes go though same stages as mitosis. Four phases Four phases: a.Prophase I b.Metaphase I c.Anaphase I d.Telophase I 6 Prophase I
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Homologous pairs of chromosomes separate 7 Meiosis I Chromosome #3 (two copies)
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Sister Chromatids Separate 8 Meiosis II
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No Interphase II No DNA Replication Four phases to divide sister chromatids. 9
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Remember: FOUR HAPLOID DAUGHTER cells are produced. Called GAMETES (eggs and sperm) 10 1n Sperm cell fertilizes 1n egg to form 2n zygote
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