Mitosis - University of Rio Grande · •Any cell has N different chromosomes. • Haploid - one set (N) •Diploid - two sets (2N) Chromosome Number N=2 2N=4 •Homologous chromosomes

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 G12N=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

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

Interphase

Aa Aa

Activity 1