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16 Cards in this Set
- Front
- Back
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What is the definition of Meiosis?
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The type of cell division that produces haploid cells (gametes).
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What is the difference in the cells produced by mitosis and meiosis?
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Normal body cells divide by mitosis and are exact replicas of the parent cell. Gametes are formed from meiosis (sperm and egg).
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What is the product of meiosis?
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4 haploid nuclei
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What is the diploid number and symbol in humans?
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number is 2, symbol is 2n.
Happens is Prophase I. |
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What is the haploid number and symbol in humans?
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number is 1, symbol is n.
Happens is Prophase I. |
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What are the stages of Meiosis?
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Prophase I
Metaphase I Anaphase I Telephase I Prophase II Metaphase II Anaphase II Telephase II |
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What happens during Prophase I?
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Crossover occurs, nuclear membrane disappears.
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What happens during Metaphase I?
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Homogolous chromosomes move to the center of the cell, held there by spindle fibres.
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What happens during Anaphase I?
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Chromosomes are pulled from either side of the cell by retracting spindle fibres.
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What happens in Telephase I?
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Cytokinesis happens and cells start to divide.
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What happens in Prophase II?
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Nuclear membrane goes away goes away, controls move to either side.
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What happens in Metaphase II?
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Chromotids line up in the middle of the cell, independent assortment takes place,
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What happens in Anaphase II?
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Chromotids are pulled by other side as the fibres contract.
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What happens in Telephase II?
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Chromotids reach either side, nuclear membrane re-forms, nucleas reappears.
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What is the difference between Meiosis Stage I and Stage 2?
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In Meiosis I, the chromosomes split into 2, they split again to 4 during Stage 2.
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What is the difference between Anaphase I and II?
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The number of chromosomes.
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