Q:

Regarding human fertility: Which is true?

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Regarding human fertility: Which is true? 


  1. Fertilization usually occurs 5-7 days before implantation and before the extrusion of the second polar body
  2. Subfertility only treated with IVF
  3. An adverse male factor is detectable in 60% of couples with low fertility
  4. Mumps in adulthood has no effect on male fertility
  5. Oligospermia means that sperm shape is abnormal

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A. Fertilization usually occurs 5-7 days before implantation and before the extrusion of the second polar body

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