Cell Cycle Regulation
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-Not all cell types have the same growth rate, meaning that the cell cycle is
regulated (in rapidly dividing cells, G1 is basically eliminated and
nondividing cells are stuck in G0, an arrested version of G1)
-Cells respond to environmental conditions
Cell Cycle Checkpoints
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, 1. End of G1 - makes sure cell has enough nutrients before it commits to S
phase
2. End of G2 - MPF present; cyclin produced if checkpoint is passed
3. During M phase - checks progression at metaphase during mitosis to
make sure separation will happen correctly
2 Types of Cellular Division
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1. Mitosis - division of genetic material into daughter cells (somatic)
2. Meiosis - reproductive cells only
Crossing Over
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-During synapsis in prophase I, two pairs of sister chromatids are held
together by synaptonemal complex
-Crossing over can occur at many locations along length of synapsed
homologs
-a form of genetic recombination that increases genetic variability of
gametes
Chromosomes
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-thread like structures; long double helix of DNA wrapped around histones
-duplicated and paired before cell division
Give this one a try later!
-Not all cell types have the same growth rate, meaning that the cell cycle is
regulated (in rapidly dividing cells, G1 is basically eliminated and
nondividing cells are stuck in G0, an arrested version of G1)
-Cells respond to environmental conditions
Cell Cycle Checkpoints
Give this one a try later!
, 1. End of G1 - makes sure cell has enough nutrients before it commits to S
phase
2. End of G2 - MPF present; cyclin produced if checkpoint is passed
3. During M phase - checks progression at metaphase during mitosis to
make sure separation will happen correctly
2 Types of Cellular Division
Give this one a try later!
1. Mitosis - division of genetic material into daughter cells (somatic)
2. Meiosis - reproductive cells only
Crossing Over
Give this one a try later!
-During synapsis in prophase I, two pairs of sister chromatids are held
together by synaptonemal complex
-Crossing over can occur at many locations along length of synapsed
homologs
-a form of genetic recombination that increases genetic variability of
gametes
Chromosomes
Give this one a try later!
-thread like structures; long double helix of DNA wrapped around histones
-duplicated and paired before cell division
