Meiosis

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Meiosis

• (meio-sex)

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Definition

• Cell division of sex cells (sperm and egg)
• aka gametes

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Meiosis

• In meiosis 4 daughter cells result, each
  containing 1/2 of the parents DNA.

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Meiosis

• For example, the common fruit fly has 8
  chromosomes. Its sex cells would contain
• 4 chromosomes.

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Meiosis

• Human somatic cells contain 46 chromosomes.
  Human sex cells contain 23 chromosomes.

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Meiosis

• Why ½ the chromosomes?
• So that when fertilization takes place, the
  offspring will receive ½ of its DNA from mom, ½
  from dad. This new combination of chromosomes
  also leads to varation.

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Meiosis

• In meiosis, the parent cell undergoes PMAT x 2.

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Meiosis and Mitosis Differences