05_cell division1 - 2n=46(44 XY/XX n=23(22 X/Y Homologous...

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Cellular basis of inheritance Mitosis and Meiosis Di Stilio- lecture 4 - 4/ 4 /11 Movies posted under “lecture videos” in the course website
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DIVISION (M) INTERPHASE (G 1 + S + G 2 ) Mit osis sis Fi gap rst In which part of the cell cycle do cells spend most of their time? Lee Hartwell Nobel Prize, 2001 The Cell Cycle
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Zygote (2 n ) Diploid adult (2 n ) Haploid gametes ( n ) Sperm Egg Normal amount of hereditary material restored Amount of hereditary material reduced by half Diploid (2 n ) Haploid ( n ) MEI OSIS MIT OSIS
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INTERPHASE G 1 PHASE S and G 2 PHASES Parent cell Sister chromatids Parent cell 4 unreplicated chromosomes (chromosomes are shown partially condensed to make them visible) 4 replicated chromosomes, each consisting of two sister chromatids MITOSIS (M PHASE) Daughter cells Parent cell At start of mitosis, replicated chromosomes condense. During mitosis, sister chromatids separate. Two daughter cells are formed by cytokinesis. Mitosis Overview
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Cytokinesis
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onion root tips Mitosis in Plants
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Unformatted text preview: 2n=46 (44+XY/XX); n=23 (22+X/Y) Homologous chromosomes in a diploid nucleus Parent cell contains homologous pair of chromosomes (2 n ) MEIOSIS I MEIOSIS II Daughter cells contain just one homolog ( n ) Homologs separate Sister chromatids separate Four daughter cells contain one chromosome each ( n ). In animals, these cells become gametes. Meiosis Overview Female gamete (egg) ( n ) Male gamete (sperm) ( n ) Fertilization Zygote (2 n ) Diploid offspring contains homologous pair of chromosomes Fertilization Restores the full complement of chromosomes Mitosis or Meiosis? What stage? Mitosis or Meiosis? What stage? MITOSIS MEIOSIS Diploid parent cell Chromosome replication Prophase Metaphase Anaphase and Telophase Two diploid daughter cells of mitosis Four haploid daughter cells of meiosis Anaphase I and Telophase I Metaphase I Meiosis II Prophase I Chromosome replication Diploid parent cell Mitosis vs. Meiosis Mitosis Meiosis...
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