Q:

During meiosis, pairing of homologous chromosomes occurs, which permits large segments of DNA to be exchanged. What is this process called?

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During meiosis, pairing of homologous chromosomes occurs, which permits large segments of DNA to be exchanged. What is this process called?


  1. Synapsis
  2. Nondisjunction
  3. Alignment
  4. Crossing over
  5. Disjunction

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D. Synapsis (pairing of homologous chromosomes) is a unique event that occurs only dur- ing meiosis I in the production of gametes. Synapsis is necessary so that crossing over, whereby large segments of DNA are exchanged, can occur.

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