005 Cell Division

Mitosis-Cytokinesis-Plant Cells

Because Plant cells have a cell wall, during cytokinesis, the cell cannot split. Therefore, the golgi apparatus produces vesicles which move to disks. They release molecules, building new cell walls.

Meiosis Overview

2 divisions resulting in 4 daughter cells, not identical to parent cells

Mitosis in detail- animal cells. Part 3

Anaphase- centomeres split & the sister chromatids go to opposite sides (opposite poles)

Diploid

(2n) number. Characteristic chromosome number. Chromosomes in pairs. Mitosis.

Haploid

(n) number. Half the diploid number. Found in gametes (sex cells). Meiosis.

What stage of Mitosis is different in plant and animcal cells?

Cytokinesis

What happens to DNA when it goes from chromatin to chromosomes?

DNA duplicates itself

Differences between Meiosis and Mitosis

Daughter cells from meiosis are genetically variable, daughter cells from mitosis are genetically identical.

Differences Between Meiosis and Mitosis

Daughter cells from meiosis are haploid, mitosis' are diploid.

Differences Between Meiosis and Mitosis

Meiosis produces 4 daughter cells, Mitosis produces 2.

Differences Between Meiosis and Mitosis

Meiosis requires 2 divisions, Mitosis requires 1.

Mitosis in detail- animal cells. Part 2

Metaphase- all the chromosomes line up in the middle, attached to their exact sister chromosome.

Differences between Meiosis and Mitosis

Mitosis occurs in somatic cells for growth and repair, Meiosis occurs in the reproductive organs for the production of gametes (sex cells).

How does cell division differ between plant and animal cells?

Mitotis division in plants follows the same basic pattern that occurs in animals, with some notable exceptions. The cells of most plants do not have centrioles. Cytokinesis occurs during telophase. The rigid cell wall ( in plants) prevents the formation of cleavage furrow during cytokinesis; instead, a cell plate forms to separate the parent cell into two daughter cells, and a new cell wall forms along the cell plate.

Mitosis Overview

One division that results in two diploid daughter cells identical to the parent cell.

Meiosis 1

Prophase I- Homologues line up side by side Metaphase I- The line up at equator synapsis Anaphase I- Assorment into daughter cells Telephase I- production of 2 daughter cells which are haploid

Meiosis 2

Prophase II- cells have 1 member of each homologous pair Metaphase II- Chromosomes line up at the equator Anaphase II- pulled to opposite sides Telephase II- nuclei form

Mitosis in detail- animal cells. Part 1

Prophase- nuclear membrane disappears and the chromosomes become visible

Mitosis in detail- animal cells. Part 4

Telephase- a new nuclear membrane forms around each set of chromosomes & the cell splits in two (cytokinesis).

Where does Mitosis occur in plant cells?

meristamatic tissue