BI+107+Chapter+13

BI+107+Chapter+13 - Chapter 13 Meiosis What is the goal of...

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Unformatted text preview: Chapter 13 Meiosis What is the goal of Meiosis? Terminology • Haploid • Diploid • Homologous Chromosomes • Autosomes • Sex chromosomes • Gamete • Zygote Fig. 13-4 Key Maternal set of chromosomes ( n = 3) Paternal set of chromosomes ( n = 3) 2 n = 6 Centromere Two sister chromatids of one replicated chromosome Two nonsister chromatids in a homologous pair Pair of homologous chromosomes (one from each set) Human Chromosomes • Total number of chromosomes in a somatic (diploid) cell? • Number of chromosomes in a gamete (haploid cell)? • How many homologous pairs of chromosomes do humans have? – Are males and females the same? Fig. 13-5 Key Haploid ( n ) Diploid (2 n ) Haploid gametes ( n = 23 ) Egg ( n ) Sperm ( n ) MEIOSIS FERTILIZATION Ovary Testis Diploid zygote (2 n = 46) Mitosis and development Multicellular diploid adults (2 n = 46) Fig. 13-6c Key Haploid ( n ) Diploid (2 n ) Mitosis Mitosis Gametes Zygote Haploid unicellular or multicellular organism MEIOSIS FERTILIZATION n n n n n 2 n (c) Most fungi and some protists Fig. 13-6bFig....
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BI+107+Chapter+13 - Chapter 13 Meiosis What is the goal of...

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