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The extra 21st chromosome that is found with Down syndrome usually comes from the father's sperm.
Q33: _ twins are to identical twins as
Q39: An XYY complement of sex chromosomes is
Q40: Your roommate remarks, "Girls seem to be
Q52: Traits associated with male stereotypes are called
Q58: Exposure to lead, mercury, or X-rays during
Q111: Cooperative play is usually first seen around
Q119: Mothers who breastfeed are more likely to
Q129: Which statement about the adjustment to having
Q150: Who is likely to make the best
Q189: Cesarean sections<br>A) should not be performed when