Meiosis Summary

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6 Terms

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Meiosis Functions

To form haploid cells with half the normal chromosome number

To rearrange the chromosomes with a novel combinations of genes (genetic combination)

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How does 1st division crate variation?

Crossing over (prophase I)

Random assortment of homologous chromosomes (Metaphase I)

Cells are haploid at the end of phase 1 but have duplicated chromosomes

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How does 2nd division create variation?

Creates 4 gametes (sex cells) that are haploid

Duplicated chromosomes separate into sister

chromatids in Anaphase II

Every gamete has a different combination of genes

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Non disjunction

Failure of an extra chromosome

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Trisomy

The presence of an extra chromosome

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Law of independent assortment

Alleles of different genes are inherited independently