10th Group A students- Discussion forum for the lesson Cell division



by bagtec2018498 Sujenthy Raveendran -
Number of replies: 0

Cell Division.

聽Cell division is the process in which a parent cell divides, giving rise to two or more daughter cells. It is an essential biological process in many organisms. It is the means used by multicellular organisms in order to grow, replenish (repair), and reproduce.

Importance of cell division for a living cell.

cell division is central to organism growth, reproduction and tissue repair.

1) Cell Reproduction.聽聽聽聽

Production of an offspring from a parent cell or a combination of parent cell.

i.聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 Asexual reproduction.

路聽聽聽聽聽聽聽聽 One parent, offspring are identical genetic copies.

路聽聽聽聽聽聽聽聽 Uses the process of cell division.

ii.聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 Sexual reproduction.

路聽聽聽聽聽聽聽聽 Two parental cells containing half the genetic information (gamete) join to form an offspring new cell having a whole set of genetic information (zygote)

路聽聽聽聽聽聽聽聽 This type of reproduction is not considered cell division (mitosis) but rather meiosis.

2) Cell growth.

Cell growth usually refers to cell proliferation, the increase in cell numbers that occurs through repeated cell division. Cell growth can also refer to the enlargement of cell volume, which can take place in the absence of cell division.

3)Cell repair.

i. Normal replacement

路聽聽聽聽聽聽聽聽 Cells have limited lifespan.

路聽聽聽聽聽聽聽聽 Cell death by apoptosis.

ii. Maintenance.

路聽聽聽聽聽聽聽聽 Cells get injured and need to heal.

路聽聽聽聽聽聽聽聽 Cell death by necrosis.

4)Unicellular organism divides and forms duplicate offspring.

5)Produce progeny from some multi cellular organisms.

E.g.- plant that grow from cuttings.

6)It is distributes the identical genetic material to daughter cell.

7)Sexually reproducing organisms develop from a single cell.

8)Cell divisions involves in repairing of cells.

聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 E.g.- born narrow makes the new blood cells.

9)Cell renewal and repair.

10) With the cell division growth occur through an increase in volume and enlargement of the outer membrane.

11)The replacement of dead cells is also an important of cell division.

i. Growth of Organisms

ii. Maintenance of Chromosome Number

iii. Maintenance of Nucleon-cytoplasmic Ratio (NC ratio)

iv. Repair

v. Reproduction in Unicellular organisms

vi. Healing and regeneration

vii. Genetic variations

viii. Formation of gamete by meiosis.