Cell cycle and cell division
- Created by: emma
- Created on: 17-04-14 14:03
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- Cell cycle and cell division
- Chromosome
- Independent DNA molecule which has folded and condensed
- During DNA replication 2 copies of the DNA molecule are made and attached at a centromere
- 2 molecules called sister chromatids
- During DNA replication 2 copies of the DNA molecule are made and attached at a centromere
- Independent DNA molecule which has folded and condensed
- Mitosis
- Prophase- nuclear membrane breaks down, Centrioles move apart, chromosomes condense
- Metaphase- centrioles complete spindle formation, chromosomes are aligned in the cell centre and attached to spindle fibres
- Anaphase- spindle fibres contract and pull sister chromatids apart to opposite poles of cell
- Telophase- Nuclear membrane starts to reform, chromosomes unwind
- Anaphase- spindle fibres contract and pull sister chromatids apart to opposite poles of cell
- Metaphase- centrioles complete spindle formation, chromosomes are aligned in the cell centre and attached to spindle fibres
- Prophase- nuclear membrane breaks down, Centrioles move apart, chromosomes condense
- Cell cycle
- After mitosis (Prophase, Metaphase, Anaphase, Telophase)
- Nuclear division- nucleus divides in two by mitosis or meiosis
- Cytokinesis- Cell divides in two
- Interphase (G1, S and G2)
- G1- cell increases in size and new biomass is made,
- S- DNA replicates
- G2- cell gets ready for division, makes stores of ATP and new organelles
- After mitosis (Prophase, Metaphase, Anaphase, Telophase)
- Nuclear division- nucleus divides in two by mitosis or meiosis
- Cytokinesis- Cell divides in two
- Interphase (G1, S and G2)
- G1- cell increases in size and new biomass is made,
- S- DNA replicates
- G2- cell gets ready for division, makes stores of ATP and new organelles
- G2- cell gets ready for division, makes stores of ATP and new organelles
- S- DNA replicates
- G1- cell increases in size and new biomass is made,
- Interphase (G1, S and G2)
- Cytokinesis- Cell divides in two
- Nuclear division- nucleus divides in two by mitosis or meiosis
- After mitosis (Prophase, Metaphase, Anaphase, Telophase)
- G2- cell gets ready for division, makes stores of ATP and new organelles
- S- DNA replicates
- G1- cell increases in size and new biomass is made,
- Interphase (G1, S and G2)
- Cytokinesis- Cell divides in two
- Nuclear division- nucleus divides in two by mitosis or meiosis
- After mitosis (Prophase, Metaphase, Anaphase, Telophase)
- Meiosis
- First meiotic division the homologus chromosomes are seperated
- Second meiotic division the sister chromatids are seperated
- Variation introduced
- Crossing over between sister chromatids during prophase one
- Random assortment of homologus chromosomes during metaphase one
- Crossing over between sister chromatids during prophase one
- First meiotic division the homologus chromosomes are seperated
- Chromosome number
- Number of chromosomes possessed by organism
- Haplod cells have one copy of each chromosome
- Diploid cells have two copies of each chromosome
- the copies of the same chromosome are called homologus chromosomes
- Chromosome
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