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Meiosis

Meiosis. Section10.2. Diploid and haploid cells. In the body cells of animals and most plants, chromosomes occur in pairs. A cell with two of each kind of chromosome is called a diploid cell and is said to contain a diploid, or 2 n , number of chromosomes.

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Meiosis

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  1. Meiosis Section10.2

  2. Diploid and haploid cells • In the body cells of animals and most plants, chromosomes occur in pairs. • A cell with two of each kind of chromosome is called a diploid cell and is said to contain a diploid, or 2n, number of chromosomes. • A cell containing one of each kind of chromosome is called ahaploidcell and is said to contain a haploid, or n, number of chromosomes.

  3. Meiosis consists of two separate divisions, known as meiosis I and meiosis II. • Meiosis I begins with one diploid (2n) cell. • By the end of meiosis II, there are four haploid (n) cells.

  4. Process of Meiosis • Meiosis I – begins with 1 cell 46 chromosomes (in humans) • Prophase I (DNA pairs have doubled) • Crossing over occurs • Metaphase I • Anaphase I • Telophase I • Ends with two cells • With 23 chromosomes each

  5. Process of Meiosis • Meiosis II • 2 Daughter cells  23 -sister chromatids • Prophase II (NO DNA doubling) • Metaphase II • Anaphase II (Sister Chromatids split in half) • Telophase II • Ends with 4 daughter cells  23 single chromosomes • Each different from each other

  6. Crossing over • Chromosomes exchange pieces during meiosis I • Gives offspring more genetic variance • Offspring are different

  7. Crossing over

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