4.1.2.2 Mitosis and the Cell Cycle
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What is the cell cycle?
• body cells in multicellular organisms dividing to produce new cells • multiple stages
What is the stage in a cell cycle when the cell divided called?
• mitosis
What do multicellular organisms use mitosis for?
• growing or replacing cells that have been damaged
What does the end of the cell cycle result in?
• two new cells identical to the original cell with the same number of chromosomes
What are the three main stages of the cell cycle?
• DNA replication • mitosis • division
What happens when te cell is not dividing?
• DNA is all spread out in long strings
What happens before a cell divides?
• the cell has to grow and increase the e amount of subcellular structures
What happens when a cell duplicates?
• it duplicates the DNA • so there is one copy for each new cell • forms x-shaped chromosomes • each arm is an exact duplicate
What happens during mitosis?
• chromosomes line up at the centre of the cell • cell fibres pull them apart • two arms of each chromosome go to opposite ends of the cell • membranes form around chromosomes, becoming the nuclei • cytoplasm and cell membrane divide
What happens after mitosis?
• produced two new daughter cells that are identical to parent cell