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Topic 3.2 Biology
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- 1Cell Cycle NamesInterphase
Prophase
Metaphase
Anaphase
Telophase - 2InterphaseG1 (S and G2) - brackets are division
in G1 protein synthesis starts, cytoplasm volume increases and new organelles produced.
- S is DNA synthesis. Chromosomes copied.
- G2 proteins needed for cell division are replicated. - 3Prophase (6)- Normal cell activity stops
- Chromosomes condense
- nucleolus breaks down
- Nuclear membrane starts to break down
- Centrioles move to opposite sides of nucleus and spindle starts to form.
- crossing over - 4Metaphase 3)- Chromatids arrange themselves along middle of the cell
- Spindle fibres attach themselves to the centromere.
- Independent assortment - 5Anaphase (2)- Sister chromatids pulled apart at centromere
- Chromatids move to opposite poles of the cell. - 6Telophase- Chromosomes reach poles of cell
- Nuclear membrane reforms
- Chromosomes become less visible
- Cytokinesis begins - 7Cytokenesis- Cell organelles become evenly distributed around nuclei.
- Microtubules form a ring around cell
- Constrict until cells separate. - 8somatic cellbody cell
- 9Totipotent- first few divisions of zygote
- convert to any cell inc. placenta, adult & foetus - 10Pluripotent- Inner mass of the blastocyst
- to all types of cell in adult body nut not into placenta and membranes - 11Multipotent- Bone marrow, in some organs and umbilical cord blood cells
- Only convert to several types of cell limited to a specific tissue or organ.
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- AS level Biology Fichas sobre Topic 3.2 Biology , creado por Hannah Smith el 09/04/2017.
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- Hannah Smith
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