What is meant by the term meiosis?
Reveal answer
Two divisions producing haploid genetically varied cells from a diploid cell.
Key words: meiosis
4(b) INHERITANCE · RECALL
4.30 Meiosis and haploid gametes
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What is meant by the term gamete?
Reveal answer
Haploid reproductive cell that can fuse at fertilisation.
Key words: gamete
What is meant by the term crossing over?
Reveal answer
Exchange of DNA between homologous chromosomes during meiosis.
Key words: crossing over
What is meant by the term independent assortment?
Reveal answer
Random orientation and separation of homologous pairs in meiosis.
Key words: independent assortment
Mitosis and meiosis: for Nuclear divisions, give the mitosis and the meiosis.
Reveal answer
Mitosis: One. Meiosis: Two.
Key words: Nuclear divisions
Mitosis and meiosis: for Daughter cells, give the mitosis and the meiosis.
Reveal answer
Mitosis: Two. Meiosis: Four.
Key words: Daughter cells
Mitosis and meiosis: for Chromosome number, give the mitosis and the meiosis.
Reveal answer
Mitosis: Maintained. Meiosis: Halved.
Key words: Chromosome number
Mitosis and meiosis: for Genetic identity, give the mitosis and the meiosis.
Reveal answer
Mitosis: Usually identical. Meiosis: Genetically varied.
Key words: Genetic identity
Mitosis and meiosis: for Main role, give the mitosis and the meiosis.
Reveal answer
Mitosis: Growth/repair/cloning. Meiosis: Gamete production.
Key words: Main role
True or false, and why? “Meiosis produces two gametes.”
Reveal answer
False. One meiotic event normally produces four haploid cells.
True or false, and why? “Meiosis copies chromosome number.”
Reveal answer
False. It halves chromosome number.
True or false, and why? “All gametes are identical because they came from one cell.”
Reveal answer
False. Meiosis generates new allele combinations.
Where does meiosis take place in humans?
Reveal answer
In the testes and ovaries.
Key words: testes · ovaries
Where does meiosis take place in a flowering plant?
Reveal answer
In the anthers and ovaries.
Key words: anthers
Why must gametes be haploid?
Reveal answer
Two gametes fuse at fertilisation → zygote is diploid → chromosome number stays the same each generation.
Key words: diploid