BIO 213-F09 - Mitosis and Meiosis

BIO 213-F09 - Mitosis and Meiosis - Structural Hierarchy of...

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DNA Fig. 8.3, p. 129 core of histone histone One nucleosome Structural Hierarchy of Chromosomes
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Chromosome Number Sum total of chromosomes in a cell 46 in humans Somatic cells Chromosome number is diploid (2 n ) Two of each type of chromosome Gametes Chromosome number is haploid ( n ) One of each chromosome type
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The Cell Cycle Cycle starts when a new cell forms During cycle, cell increases in mass and duplicates its chromosomes Cycle ends when the new cell divides
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Interphase Longest part of cell life Cell increases in mass Number components doubles DNA is duplicated
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Stages of Interphase G1 Interval or gap after cell division S Time of DNA synthesis (replication) G2 Interval or gap after DNA replication
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Mitosis Period of nuclear division Usually followed by cytoplasmic division Four stages: Prophase Metaphase Anaphase Telophase
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Fig. 8.4, p. 130
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BIO 213-F09 - Mitosis and Meiosis - Structural Hierarchy of...

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