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What is meiosis?
Meiosis involves producing gametes. In meiosis,
the number of chromosomes is halved from
the diploid number (2n) to the haploid
number (n). Cells are diploid when the
chromosomes are present in homologous
pairs and cells are haploid when only one
chromosome from each homologous pair is
present.…read more

Slide 3

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The two stages of meiosis
· The chromosomes of each homologous pair
are separated
· The sister chromatids are separated
· All the gametes produced by meiosis are
different and they show variation (genetically
different gametes).…read more

Slide 4

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Why is meiosis so important?
1) When the gametes fuse at fertilisation to
form the zygote, the diploid number of
chromosomes is restored. This enables a
constant chromosome number to be
maintained generation after generation.
2) Genetically different gametes are produced.…read more

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Meiosis I and Meiosis II
In meiosis I, the homologous chromosomes are
In meiosis II, the sister chromatids are separated
The product of meiosis are four genetically
different haploid cells…read more

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Crossing over
· This is an event in meiosis that leads to the
cells that are produced being genetically
· Sometimes it is called genetic recombination
· Crossing over occurs when the chromosomes
are in their homologous pairs, during the early
part of meiosis I.…read more

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