MitosisGenetics 26404/36404
CellCell Membrane
Cytoplasm
Nucleus
Nuclear Membrane
Nucleolus
Centriole
Plant Cellcell wall
Chromosomes
• dark staining body
• composed of DNA and protein
• visible when cell divides
Chromosome Structure
Centromere
Chromatids
Replicated Chromosome
• Any cell has N different chromosomes.
• Haploid - one set (N)
• Diploid - two sets (2N)
Chromosome Number
N=2
2N=4
• Homologous chromosomes - pairs
• Cell division producing 2 daughter cells identical to parent cell.
2N14
2N14
2N14
N7
N7
N7
Mitosis
Cell Cyclemitosis
Interphase
G1G2
S
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 G1
Aa
Aa
Interphase S and G2
Aa
Aa
Prophase
•Nuclear membrane disappears•Nucleoli disappear•DNA condenses into chromosomes•Centrioles divide & separate
A aA a
Metaphase
•Chromosomes in line•Attach to spindles
a
AA
a
Anaphase
•Chromosomes move to opposite sides
a
A A
a
Telophase
•New nucleus forms•Nucleoli form•DNA uncoils•Cytokinesis occurs
aA aA