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Cell Reproduction

Cell Reproduction. 8.1 Chromosomes 8.2 Cell Division 8.3 Meiosis. Chromosome Structure. During cell division DNA condenses to form chromosomes. Eukaryotic cells DNA wraps around histones Activity of specifc regions controlled by nonhistone proteins. Chromatid Centromere Tetrad.

vivian-charles
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Cell Reproduction

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  1. Cell Reproduction 8.1 Chromosomes 8.2 Cell Division 8.3 Meiosis

  2. Chromosome Structure • During cell division DNA condenses to form chromosomes. • Eukaryotic cells DNA wraps around histones • Activity of specifc regions controlled by nonhistone proteins

  3. Chromatid • Centromere • Tetrad

  4. Chromatid • Centromere

  5. Chromosomes Numbers • Sex chromosomes • Autosomes • Homologous chromosomes • Karyotype • Diploid cells • Body cells • Haploid cells • Sex cells (gametes)_ Click

  6. Cell Division Prokaryotes • Binary Fission

  7. Eukaryotes • Mitosis

  8. The cell cycle • Interphase • Mitosis • Cytokinesis

  9. During cell reproduction:

  10. Cytokinesis in Plant Cells

  11. Meiosis • Produces 4 haploid gametes • Egg (n) • Sperm (n) • Fusion of egg & sperm results in zygote (2n)_

  12. Meiosis I • Synapsis occurs forming a tetrad • Prophase I, crossing over can occur. • genetic recombination. • Independent assortment • genetic variation.

  13. Meiosis II Results in 4 new cells, each with single set (n) of chromosomes.

  14. Formation of Gametes • In reproductive organs • Testes • Ovaries • Spermatogenesis • Spermatids • Oogenesis • 1 egg cell • 3 polar bodies

  15. The cell cycle • Interphase • Mitosis • Cytokinesis

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