Meiosis is a two-part cell division process in organisms that sexually reproduce.
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Why is meiosis necessary?
For the production of haploid gametes to maintain the diploid number of species, generation after generation. Its also to increase genetic diversity in a species
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how does 'crossing over' of chromosomes ensure genetic variation?
The exchange of corresponding chromatid segments between homologous chromosomes occurs. This switches sections of two of the sister chromatids so inner two chromatids have new combinations of alleles.
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What is meant by a 'haploid' cell?
Having only one set of chromosomes (n), in contrast to diploid (2n).
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A mule has 63 chromosomes. suggest why mules cannot produce gametes and therefore sterile
with 63 chromosomes, precise pairings are impossible. This prevents meiosis and hence gamete production, making them unable to reproduce
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how does 'independent segregation' of chromosomes ensure genetic variation?
. the assortment of the chromosomes (the order they lie in) can determine what genetic information is present in each of the 4 gametes produced. With 23 chromosomes in a human gamete, their are 2^23 combinations.
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Other cards in this set
Card 2
Front
Why is meiosis necessary?
Back
For the production of haploid gametes to maintain the diploid number of species, generation after generation. Its also to increase genetic diversity in a species
Card 3
Front
how does 'crossing over' of chromosomes ensure genetic variation?
Back
Card 4
Front
What is meant by a 'haploid' cell?
Back
Card 5
Front
A mule has 63 chromosomes. suggest why mules cannot produce gametes and therefore sterile
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