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Mitosis Genetics 26404/36404 Cell Cell Membrane Centriole Nucleus Nuclear Membrane Nucleolus Cytoplasm Plant Cell cell wall Chromosomes • dark staining body • composed of DNA and protein • visible when cell divides Chromosome Structure Replicated Chromosome Centromere Chromatids Chromosome Number • Any cell has N different chromosomes. • Haploid - one set (N) N=2 • Diploid - two sets (2N) • Homologous chromosomes - pairs 2N=4 Mitosis • Cell division producing 2 daughter cells identical to parent cell. N 7 2N 14 2N 14 2N 14 N 7 N 7 Cell Cycle mitosis G1 G2 Interphase S Interphase G1 2N=4 Interphase S and G2 Prophase •Nuclear membrane disappears •Nucleolus disappears •DNA condenses into chromosomes •Centriole divides & moves to opposite side Metaphase •Chromosomes in line •Attach to spindles Anaphase •Chromosomes move to opposite sides Telophase •New nucleus forms •Nucleoli form •DNA uncoils •Cytokinesis occurs Interphase Plant Mitosis Interphase G1 Aa A a Interphase S and G2 AA aa Prophase AA aa •Nuclear membrane disappears •Nucleoli disappear •DNA condenses into chromosomes •Centrioles divide & separate Metaphase AA aa •Chromosomes in line •Attach to spindles Anaphase A A a a •Chromosomes move to opposite sides Telophase A a A a •New nucleus forms •Nucleoli form •DNA uncoils •Cytokinesis occurs Interphase Aa Aa Activity 1
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