AP_Bio_-_meiosis

AP_Bio_-_meiosis - contain both maternal and paternal...

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Meiosis n = number of unique chromosomes Haploid cells are n Diploid cells are 2n
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Sexual Reproduction Patterns
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Overview of Meiosis Interphase: Chromosomes are duplicated. 2n(x2) Homologous chromosomes are split n(x2) Sister chromatids are split n
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Recombination possibilities = 2 n
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Humans n = 23 How many unique gametes can a human make? If each partner can make 8 million different chromosome combinations in the gametes, how many unique combinations can zygotes have? 8 million x 8 million = 64,000,000,000,000 different diploid combinations per couple.
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Fig. 9.4a p. 142 plasma membrane newly forming microtubules in the cytoplasm spindle equator (midway between the two poles) one pair of homologous chromosomes PROPHASE I METAPHASE I ANAPHASE I TELOPHASE I MEIOSIS I
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Prophase II Metaphase II Anaphase II Gametes (Telophase II)
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Increasing recombination frequencies During Prophase I “crossing over” allows one chromatid of each homologous chromosome to exchange pieces. Results in chromosomes that
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Unformatted text preview: contain both maternal and paternal genes. Human Reproduction Syngamy = Fusion of gametes = fertilization Gametes are made from germ cells or primary sex cells Gametogenesis is not the same for men and women. GROWTH MEITOSIS I, CYTOPLASMIC DIVISION MEIOSIS II, CYTOPLASMIC DIVISION cell differentiation, sperm formation (mature, haploid male gametes) spermatids (haploid) secondary spermatocytes (haploid) primary spermatocyte (diploid) spermato-gonium (diploid male reproductive cell) Spermatogenesis GROWTH MEITOSIS I, CYTOPLASMIC DIVISION MEIOSIS II, CYTOPLASMIC DIVISION ovum (haploid) primary oocyte (diploid) oogonium (diploid reproductive cell) secondary oocyte (haploid) first polar body haploid) three polar bodies (haploid) Oogenesis In humans the oocytes stay in prophase I until puberty. In each menstrual cycle one completes meiosis I. Meiosis II does not even occur until the sperm penetrates the egg....
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AP_Bio_-_meiosis - contain both maternal and paternal...

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