Flashcards in Mitosis Deck (13):
What is mitosis
Is division of a cell that results in each of the daughter cells having an exact copy of the dna of the parent cell
Benefit of mitosis?
growth and repair of tissues
What are the stages of interphase
G1:protein synthesis - cell increases in mass, new organelles and proteins formed
S: dna replication and amount of chromatin doubled
G2: organelle synthesis- spindle proteins synthesised
What are the 4 stages of mitosis
What happens during in prophase
Chromosomes condense and become visible. Sister chromatids are held together by centromere
Nucleolus breaks down and nuclear membrane breaks down.
Spindle fibres develop
What happens during metaphase
Chromosomes line up at the equator and attach to the spindle fibres at the centromere
What happens during anaphase
Spindle fibres contract and pull Chromatids to opposite ends of the cell
What happens during telophase
New nuclear membrane forms around the chromosome
After telophase is cytokinesis. What happens during it?
Cellular division occurs and 2 genetically identical daughter cells are produced, containing a full set of chromosomes (diploid cells)
Importance of mitosis?
Genetically identical cells
How do prokaryotic cells replicate
Describe binary fission
Circular dna molecule replicates and both copies attach to the cell membrane
The plasmids also replicate
The cell gets bigger and he dna loops move to opposite ends of the cell
Cytoplasm begins to divide and New call walls begins to form
Cytoplasm divides and 2 daughter cells are produced.
Each daughter cell has one copy of the circular dna, but can have a variable number of copies of plasmids