Flashcards in B2 Deck (10):
Why does mitosis occur?
-replace worn out cells
- repair damaged tissue
What are the 4 stages of mitosis?
DNA Replication, movement of chromosomes, cytokinesis and growth of the daughter cell
What happens to the SA:V Ration as the size of an organism increases?
What is lysis?
What is crenation?
What is Turgid?
Cell increases turgor pressure causing it to become rigid
What is flaccid
Little pressure. Cell remains same
What is plasmolysis?
Cell contents collapse away from the cell wall
How does mitosis occur?
1) DNA replicates
2) chromosomes line up in the centre
3) two identical copies of chromosome separate and move to opposite ends of the cell
4) each end now contains full set of identical chromosomes
5) two new nuclei from. Cytoplasm pinches and two new daughter cells are formed.