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Cell Reproduction
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What is the 'cell cycle'?
The period between the formation of a new cell and when it divides to produce two offspring cells
What is interphase?
Briefly describe the different stages
Interphase
: the stage in the cell cycle during which various molecules are synthesised and Dna is replicated
G1
: pre DNA synthesis
S
: DNA synthesis
G2
: post DNA synthesis
Mitosis: prophase
The first stage
chromosomes begin to condense (shorten and thicken)
Each chromosome is double stranded (from S phase)
Nuclear membrane diappears
network of fibres appear- spindle
Mitosis: metaphase
Chromosomes gather on the equator of the spindle
Centromere of each chromosome attaches to the spindle fibres
Mitosis: anaphase
Spindle fibre contracts
Centromere of each chromosome is pulled in two directions and splits
Drawn to opposite poles
Mitosis: Telophase
Nuclear membranes form around each group of chromosomes
What happens during cytokinesis?
After mitosis
Separates the 2 daughter nuclei into separate cells
Cell membrane pinches in dividing the ell into two daughter cells
What is meiosis?
A reduction division
Produces gametes
Involves one replication of DNA and two nuclear divisions
Results in halving the number of chromosomes of a parent diploid nucleus to 4 haploid daughter nuclei
Author
Anonymous
ID
279871
Card Set
Cell Reproduction
Description
Cell reproduction: cell cycle, apoptosis, binary fission, gamete production; inputs and outputs of meiosis
Updated
7/28/2014, 12:39:51 PM
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