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What must ococur before successive reproduction?
Between divisions, cells must?
grow and replicate their DNA
time of growth and DNA replication between cell divisions
G1 (First GAP)
growth (transcription and translation)
S phase (synthesis)
G2 (second gap)
growth (transcription and translation(
A cell iin G2 has 16 DNA molecules in the nucleus. How many DNA molecules will it have in G1?
What does the cell look like in interphase?
- DNA chromosomes uncoliled (not visible)
- nuclear membrane intact
- nucleolus visible
When can we actually see DNA?
an independent structure of DNA (and protein) that is visible with a light microscope
A supercoiled DNA molecule that is visible with a DNA molecule
specialized region of chromosome at which two sister chromatids are held together?
When do you have sister chromatids?
S phase when chromosome duplicates its DNA
How many types of chromosomes can you have?
- two types
- 2- chromatid and 1- chromatid chromosomes
What are the steps in prophase?
- centrioles move apart
- spindle and aster form
- chromosoems attach to spindle fibers
- nucleolus fades
- nuclear membrane disintegrates
What are the steps in metaphase?
chromosomes line up along cell equator
What are the steps in anaphase?
- centromeres uncouple
- identical chromatids are pulled apart; resultant chromosomes move to opposite poles
If a cell has six chromosomes at metaphsae of mitosis, in anaphase, how many will it have?
Telophase is basically what in reverse.
What are the steps in telophase?
- DNA uncoils
- spindle disintegrates
- nucleolus reappears
- nuclear membrane reforms