CH17_Lecture - Chapter 17 Principles of Human Heredity 17-1...

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Chapter 17 Principles of Human Heredity
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17-1 Meiosis and Gamete Formation During gamete formation, germ cells undergo a special kind of division called meiosis. It reduces the number of chromosomes by half. Meiosis is a type of nuclear division found only in germ-cell production in the gonads of sexually reproducing animals. Meiosis involves two cellular divisions.
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Meiosis I and II Meiosis I is a reduction division. The chromosome number is halved. Meiosis II is like mitosis in many ways. When haploid cells divide in meiosis II, they produce two new cells. Each cell contains a haploid number of single- stranded chromosomes.
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Figure 17-1
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Gamete Production In males, meiosis produces four gametes In females, meiosis produces one gamete.
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Figure 17-2
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Figure 17-3
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17-2 Principles of Heredity Much of our early knowledge on heredity came from the work of Gregor Mendel. Mendel was a 19 th century monk who performed genetic experiments on pea plants. Figure 17-4 © Bettman Archive/Corbis
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Blending of Traits Mendel discovered that the traits he was studying did not blend. Instead of purple x white = pink, the more dominant color appeared in offspring.
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Principle of Segregation Mendel discovered that the parents contributed equally to the characteristics of their offspring. So each parent contributes only one hereditary factor, their paired factors must separate in gamete formation.
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