In a pair of siblings, one is homosexual. How often will the other sibling be homosexual compared with frequency observed among the general population?
A. at the same rate as the general population
B. 2-7 times less likely, compared with the general population
C. 2-7 times more likely, compared with the general population
D. if one sibling is homosexual, the other sibling cannot be homosexual
Answer: C
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People with schizophrenia are more likely to have been born during the winter months. One explanation for this phenomenon is that
A) people born during these months are more likely to be exposed to the flu virus while still in the womb. B) cold temperatures slow down neuronal development. C) summer heat negatively affects the genetic maternal in sperm at the time of conception (9 months earlier). D) Eggs released during the summer—9 months earlier—are more likely to contain genetic errors.
It is difficult to distinguish between colors at night because __________
a) we are seeing primarily with the cones. b) rods do not adapt to the dark. c) we are seeing primarily with the rods. d) we are used to seeing mostly with the fovea.