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Mitosis & Meiosis - Coggle Diagram
Mitosis & Meiosis
Meiosis
a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.
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Chromosomes
Each DNA strand is split into chromosomes• All sexually reproducing animals have pairs of chromosomes. One set of each pair comes from each parent• Humans have 23 pairs
Interphase
Cell is actively synthesising proteins. The chromosomes are not visible prior to mitosis. The DNA replicates
Prophase
The nuclear membrane breaks down. The nucleolus disappears. The DNA is free in the cytoplasm. Chromosomes condense and become shorter. The chromosomes become visible.
Centrioles divide and move to the poles of the cell. Spindle fibres form across the cell.
Metaphase
Chromosomes move to the equator of the cell (they line up in single file).
Chromosomes attach to the spindle at their centromere.
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Telophase
Nuclear membrane forms around each group of chromosomes - the cell has 2 nuclei briefly. The nucleolus reforms.
The chromosomes unwind and become diffuse (decondense) and are no longer visible. The cells split down the middle and two new cell membranes form.
Meiosis
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•Instead of producing two identical daughter cells, meiosis produces four non-identical daughter cells, each with only half the number of chromosomes (23 instead of 23 pairs in humans)
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