Biology Chapter 2 - Part 1
- Created by: ebony284
- Created on: 27-12-18 16:25
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- chromosomes carry the genes that contain the instructions for making new cells and all tissues and organs needed.
- the cell cycle makes new cells for growth, development and repair.
- body cells in multicellular organisms divide to produce new cells as part of a series of stages called the cell cycle.
- multicellular organisms use mitosis to grow or replace cells that have been damaged.
- the end of the cell cycle results in two new cells identical to the original cell, with the same number of chromosomes.
- two main stages of the cell cycle:
- growth and DNA replication: in a cell that isn't dividing, the DNA is spread out in long strings. Before it divides, cell has to grow and increase the number of subcellular structures. it then duplicated its DNA, so there's one new copy for each new cell. The DNA is copied and forms X-shaped chromosomes.
- mitosis: chromosomes line up at the centre of the cells and cell fibres pull them apart. the two…
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