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Chromosomes

Chromosomes. Chromosomes. *Walther Flemming, a German biologist, in 1882 discovered chromosomes *Chromosomes are rod shaped structures that are found in the nucleus of every cell in an organism. Chromosomes. Notes: *Humans have 23 pairs of chromosomes.

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Chromosomes

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  1. Chromosomes

  2. Chromosomes *Walther Flemming, a German biologist, in 1882 discovered chromosomes *Chromosomes are rod shaped structures that are found in the nucleus of every cell in an organism

  3. Chromosomes Notes: *Humans have 23 pairs of chromosomes. *In each pair, one chromosome comes from the mother and the other from the father.

  4. Chromosomes Notes: Twenty-two of the pairs are the same in both men and women, and these are called autosomes.

  5. Chromosomes

  6. Chromosomes Notes: *The twenty-third pair consists of the sex chromosomes, so called because they are the primary factor in determining the gender of a child. *The sex chromosomes are known as the X and Y chromosomes.

  7. Chromosomes Notes: Females have two X chromosomes, and males have one X and one Y chromosome.

  8. Chromosomes Point: The Y chromosome is about one-third the size of the X chromosome.

  9. Chromosomes Point: A sperm, the reproductive cell produced by the male, can carry either one X or one Y chromosome. An egg, the reproductive cell produced by the female, can carry only the X chromosome.

  10. Chromosomes Who determines the sex of the baby? Is it the mother or father? X X X Y

  11. Chromosomes Point: When a sperm with an X chromosome unites with an egg, the result is a child with two X chromosomes—a female. When a sperm with a Y chromosome unites with an egg, however, the result is a child with one X and one Y chromosome—a male. Thus, the father determines the gender of the child.

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