Chapter 2 Lecture Notes and Behavior Genetics

Chapter 2 Lecture Notes and Behavior Genetics - Chapter 2...

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Unformatted text preview: Chapter 2 Lecture Notes and Behavior Genetics Meiosis Meiosis: This is division of the germ cells (i.e., the male or female reproductive cells) The result is that, for a male, the sperm (or egg) cells contain half the number of chromosomes (N=23) that normal cells in other parts of the body contain (N=46). Meiosis results in sperm (or egg) cells that are a more or less random collection of one each of the chromosomes from Mom and Dad; Meiosis for a male: His germ cells start out with 23 pairs of chromosomes, one set from mom (m) and one set from dad (d), with crossover for half of germ cells. After Meiosis Mom Dad Sperm#1 Sperm#2 Sperm #3 Sperm #4 . . . 1 m d m d mc dc 2 m d d mc m dc 3 m d dc m c mc 4 m d 5 m d 6 m d 7 m d 8 m d 9 m d 10 m d 11 m d 12 m d 13 m d 13 m d 14 m d 15 m d 16 m d 17 m d 18 m d 20 m d 21 m d 22 m d 23 X Y X Y Y X Meiosis for a female: Her germ cells start out with 23 pairs of chromosomes, one set from mom (m) and one set from dad (d), with crossover for half of germ cells. After Meiosis Mom Dad Sperm#1 Sperm#2 Sperm #3 Sperm #4 . . . 1 m d m d mc dc 2 m d d mc m dc 3 m d dc m c mc 4 m d 5 m d 6 m d 7 m d 8 m d 9 m d 10 m d 11 m d 12 m d 13 m d 13 m d 14 m d 15 m d 16 m d 17 m d 18 m d 20 m d 21 m d 22 m d 23 X X X X X X Meiosis The figure includes crossover: half of the m and d chromosomes interchange genetic material with each other. genetic material with each other....
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Chapter 2 Lecture Notes and Behavior Genetics - Chapter 2...

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