Cell division by meiosis

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https://www.youtube.com/watch?v=mc4ZMhgDGKU

Last updated 7:00 PM on 6/19/26
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7 Terms

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Homologous pair of chromosomes

One from eah parent

The same genes in same positions (can be different alleles)

Same length and size.

<p>One from eah parent</p><p>The same genes in same positions (can be different alleles)</p><p>Same length and size.</p>
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Allele

Form of a gene

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Locus

Where on the chromosomes the alleles are

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Haploid

Half the number of chromosomes (23 in humans)

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Diploid

Full set of chromosomes (23 pairs = 46

<p>Full set of chromosomes (23 pairs = 46</p>
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How can genetic variation be creatd

Crossing over - chromatids twist around each other and swap

Contain the same genes but different alleles.

Random fertiliation - any sperm can fertilise any egg

Each indiviual is unike any to have exstedbefore or any that will exit again

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