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14 Cards in this Set
- Front
- Back
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A sex cell is |
A gamete |
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What is mitosis |
Cell growth and repair, the cells cycle |
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Interphase |
DNA replicates chromosomes are duplicated forming chromatin joined at the centre by a centomere |
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Prophase |
Centroles start forming spindle fibres (microtubules) and start to move apart. Nuclear membrane starts to breakdown. |
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Metaphase |
Spindles occupy most of cell. Centrioles are at the poles. Spindles attach to the centomere connecting the chromatids to the centrioles . Chromatids form a line across the cell |
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Anaphase |
Centimeters break apart. Spindle fibres break apart and contract back towards the poles. Rapid phase.chromatids look like v or octopuses. |
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Telophase |
Spindles break down. Chromosomes lengthen. Membrane reappears. 2 nuclei are formed |
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Remember mitosis |
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List them! |
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Cytoplasmic division |
Cytokinesis. The cell separates, this phase overlaps the telophase |
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Why do we need mitosis? |
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Meiosis |
Cell division which produces gametes. Also known as reduction division because it produces four haploid cells from a diploid cell |
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Gametes |
23 chromosomes and are either egg cells or sperm cells |
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Fertilisation |
When two gametes come together to combine chromosomes making 46. These then duplicate . Chromosomes then pair up Swap sections of DNA There is now 2 lots of 46 chromosomes These split in miosis 1 to form 2 daughter cells with 46 chromosomes each. In meiosis 2 these daughter cells divide again to have 23 chromosomes |
