How Cells Divide

Chapter 9-10

Cell Division

*growth and repair

*reproduction

Cell Division

*divide contents of cell

*replicate genetic information

2 parts:

Cell Division

parent cell

daughter cells

Prokaryotic cells

Binary Fission

Binary Fission

1. Replicate the genetic material

2. Divide the cell

Cell Division

Eukaryotic Cells

Eukaryotic Cells

Chromosomes

Cell Division

1. Replicate the genetic material

2. Divide the cell

Mitosis

*growth and repair

Eukaryotic Cells

Meiosis*production of gametes

Eukaryotic Cells

Cell Cycle

Cell Cycle

Interphase

Division (meiosis or mitosis)

Mitosis

Inter-phase

Human chromosomes

Human chromosomes

23 pairs of chromosomes

46 chromosomes

haploid number

diploid number

Human chromosomes

23 pairs

46 chromosomes

Homologous pair

Homologous chromosomes

One from the egg

One from the sperm

Homologous chromosomes

Replicated chromosomes

Interphase

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

Cytokinesis in an animal cell

Cancer Cells

Cancer Cells

Meiosis and Sexual Cycles

Asexual reproduction

Sexual Reproduction

Sexual Reproduction

Meiosisaka: reduction division

2nn

Meiosisaka: reduction division

2nn

Gamete formation

Meiosis

*replicate chromosomes

*two cell division phases

Meiosis

ONE (1) 2n cell

FOUR (4) n cells

Meiosis I

Meiosis I

Prophase I metaphase I Anaphase I

Meiosis Itelophase I

Meiosis I

Meiosis I

Prophase I

*Crossing over (= synapsis)

*Crossing over (= synapsis)

Meiosis I

Prophase I

*Crossing over (= synapsis)

Meiosis II

Meiosis IIProphase II metaphase II Anaphase II

Meiosis IItelophase II cytokinesis

Meiosis II

MeiosisStart: diploid (2n)

End: haploid (1n)

Meiosis

Meiosis

Mitosis