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Meiosis is a reduction division.
the chromosome number is halved
it involves two divisions
produces cells that are genetically different from the parent cell
can be used for sexual reproduction
Sexual reproduction
the offsprings are genetically different from each other and from the parents
each parent produces special reproductive cells, called gametes
the gametes fuse together at fertilisation to form a zygote

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Genetic variation
Meiosis and germline fertilisation increase genetic variation in a number of ways:
through the process of crossing over during prophase I (this occurs where alleles can be
shuffled between chromosomes where they cross over at points called chiasmata)
through genetic reassortment due to the random distribution and subsequent segregation of
the chromosomes during meiosis I (and the chromatids during meiosis II)
through random mutation
fertilisation itself introduces random variation: only one sperm contributes its DNA, and yet
there are about 300 million sperm…read more


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