Reproduction

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Chapter 9 - Chromosomes, the Cell Cycle, and Cell
Division
HeLa cells
Henrietta Lacks
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• Chromosome structure
• Prokaryote vs eukaryotes
• Histones, organization
• Ploidy
• Cell cycle and reproduction
• Mitosis
• Asexual reproduction
• Meiosis
• Sexual reproduction

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Eukaryote DNA packing
To next figure
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Organization of chromatin
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Ploidy

• Haploid germ cells
• Diploidsomatic cellshomologous pairs of
  chromosomes

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Mitosis

• 1 cell becomes 2 identical daughter cells
• Produces clones.
• asexual reproduction, budding, fragmentation,
  parthenogenesis
• growth and development, tissue replacement in
  multicellular organisms
• Learn about mitotic cycle in lab

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Mitotic cell from newt lung chromatin blue,
microtubules green, actin red
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Functions of cell division by mitosis
8-cell embryo
Root tip
Growth, Development, Asexual reproduction
Dividing amoeba
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Functions of cell division by mitosis
Tissue renewal and regeneration
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Mitosis of a diploid cell (diagrams completed in
lecture)
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Meiosis

• cell division to make gametes for sexual
  reproduction
• One diploid cell produces 4 haploid cells
  (gametes)
• Fertilization
• A pair of haploid gametes (typically egg and
  sperm) combine to make a diploid zygote

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Meiosis(diagrams completed in lecture)
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First division
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Second division
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Fertilization