Cell Division

The Cell Cycle & Cell Division : The Cell Cycle & Cell Division © © 2009 , Dr Tanmay Mehta

The Cell Cycle : The Cell Cycle

MITOSIS : MITOSIS

Mitosis : Mitosis The process of cell division which results in the production of two daughter cells from a single parent cell. The daughter cells are identical to one another and to the original parent cell.

Mitosis can be divided into stages : Mitosis can be divided into stages Interphase Prophase Metaphase Anaphase Telophase & Cytokinesis

InterphaseThe cell prepares for division : InterphaseThe cell prepares for division Animal Cell DNA replicated Organelles replicated Cell increases in size Plant Cell DNA replicated Organelles replicated Cell increases in size

Interphase : Interphase Animal Cell Plant Cell

ProphaseThe cell prepares for nuclear division : ProphaseThe cell prepares for nuclear division Animal Cell Packages DNA into chromosomes Plant cell Packages DNA into chromosomes

Prophase : Prophase Animal Cell Plant Cell

MetaphaseThe cell prepares chromosomes for division : MetaphaseThe cell prepares chromosomes for division Animal Cell Chromosomes line up at the center of the cell Spindle fibers attach from daughter cells to chromosomes at the centromere Plant Cell Chromosomes line up at the center of the cell Spindle fibers attach from daughter cells to chromosomes at the centromere

Metaphase : Metaphase Animal Cell Plant Cell

AnaphaseThe chromosomes divide : AnaphaseThe chromosomes divide Animal Cell Spindle fibers pull chromosomes apart ½ of each chromosome (called chromotid) moves to each daughter cell Plant Cell Spindle fibers pull chromosomes apart ½ of each chromosome (called chromotid) moves to each daughter cell

Anaphase : Anaphase Animal Cell Plant Cell

TelophaseThe cytoplasm divides : TelophaseThe cytoplasm divides Animal Cell DNA spreads out 2 nuclei form Cell wall pinches in to form the 2 new daughter cells Plant Cell DNA spreads out 2 nuclei form New cell wall forms between to nuclei to form the 2 new daughter cells

Telophase : Telophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Slide 16 : Animal Mitosis -- Review

Slide 17 : Plant Mitosis -- Review

MEIOSIS : MEIOSIS

Meiosis : Meiosis Meiosis is the type of cell division by which germ cells (eggs and sperm) are produced. One parent cell produces four daughter cells. Daughter cells have half the number of chromosomes found in the original parent cell

Meiosis : Meiosis During meiosis, DNA replicates once, but the nucleus divides twice.

Meiosis : Meiosis Four stages can be described for each division of the nucleus.

Meiosis I : Meiosis I First division of meiosis

First Division of Meiosis : First Division of Meiosis Prophase 1: Each chromosome duplicates and remains closely associated. These are called sister chromatids. Metaphase 1: Chromosomes align at the center of the cell. Anaphase 1: Chromosome pairs separate with sister chromatids remaining together. Telophase 1: Two daughter cells are formed with each daughter containing only one chromosome of the chromosome pair.

Prophase I : Prophase I

Prophase I : Prophase I

Metaphase I : Metaphase I

Telophase I : Telophase I

Meiosis : Meiosis Second Division of Meiosis

Second Division of Meiosis : Second Division of Meiosis Prophase 2: DNA does not replicate. Metaphase 2: Chromosomes line up at the center of the cell Anaphase 2: Centromeres divide and sister chromatids move separately to each pole. Telophase 2: Cell division is complete. Four haploid daughter cells are formed.

Prophase II : Prophase II

Metaphase II : Metaphase II

Telophase II : Telophase II

Meiosis : Meiosis

Meiosis Animation : Meiosis Animation

Differences in Mitosis & Meiosis : Differences in Mitosis & Meiosis Mitosis Asexual Cell divides once Two daughter cells Genetic information is identical Meiosis Sexual Cell divides twice Four haploid daughter cells Genetic information is different