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1.6 Cell division
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- 1Outline the processes occurring in interphasemetabolic reaction, DNA replication in nucleus, protein synthesis in cytoplasm, no. of mitochondria increases (growth and divide), no. of chloroplast increases, G1, S phase, G2
- 2S phasecell replicates all the genetic material in nucleus, completed set of genes
- 3Define mitosisThe process where a single cell divides resulting in generally two identical cells, each containing the same number of chromosomes and genetic content as that of the original cell.
- 4State the product of mitosisTwo daughter cells (two diploids) that are chromosomally identical to the parent.
- 5Briefly describe the stages of mitosisInterphase:Chromosomes are not visible; chromosomes make a copy of itself. (parent cell).
Prophase:Copies of chromosomes fasten together;nuclear membrane disappears.
Metaphase:Chromosomes line up along the centre.
Anaphase:Chromosomes split apart and are pulled to opposite ends of cells.
Telophase: Chromosomes become hard to see; cells split and 2 nuclear membranes form. (two daughter cells). - 6Compare cytokinesis in plant and animal cellIn animal cells, the first sign of cytokinesis is the appearance of an indentation around the middle of the cell. The ring contracts like the pulling of a drawstring and pinches the parent cell in two. Because the two new nuclei are forming at the ends of the cell, cytokinesis results in two new cells.In cytokinesis a cell plate forms inside the cell and grows outward. Eventually this new piece of cell wall divides the cell in two. The result is two daughter cells, each bounded by its own continuous membrane and its own cell wall.
- 7State that cyclins are involved in the control of the cell cycle
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- Rosy M. C.
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