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  Normally menstruation occurs when ________.  

  How many secondary oocytes ultimately develop from each primary oocyte?  

  Stretching of the cervix causes oxytocin secretion to…..  

  The basic difference between spermatogenesis and oogenesis is that ________.  

  If gametes were diploid like somatic cells, how many chromosomes would the zygote contain?  

  The corpus luteum prevents loss of the implanted embryo through menstruation by secreting ________.  

  The result of polyspermy (= more than one sperm penetrating the egg) in humans is ________.  

  Which of the following hormones controls the release of anterior pituitary gonadotropins?  

  Select the CORRECT statement about the uterine cycle.  

  Effects of estrogen include ________.