Meiosis and Variation

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What is the purpose of sexual reproduction?

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To have the genetic makeup of offspring different from that of its parents.

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What three factors are responsible for the genetic variation of all sexually reproducing organisms?

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  1. independent assortment
  2. random fertilization
  3. crossing over
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6 Terms

1
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What is the purpose of sexual reproduction?

To have the genetic makeup of offspring different from that of its parents.

2
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What three factors are responsible for the genetic variation of all sexually reproducing organisms?

  1. independent assortment
  2. random fertilization
  3. crossing over
3
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What is independent assortment and when does it occur?

hhen genes that do not reside on the same chromosome may sot independent of one another; this happens during anaphase 1 of meiosis

4
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What is crossing over and when does it occur?

when genetic information is exchanged between homologues, furthering the shuffling of genetic information; happens during prophase 1 of meiosis

5
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With whom does the chromatid cross over with?

non-sister chromatids of homologous chromosomes

6
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Which chromosomes do not have a homolog and thus do not usually cross over?

the Y chromosome