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mysttrr mysttrr
wrote...
Posts: 723
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6 years ago
Crossing-over requires:
 
  a. the physical exchange of parts of homologous chromosomes.
  b. chromosome duplication during meiosis.
  c. the fusion of gametes to restore the diploid number of chromosomes.
  d. A and B.
  e. None of the above.
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6 years ago
D
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