Effective polygyny
A) refers to greater reproductive variance among males.
B) tends to be associated with competition and risk taking among males.
C) may partly account for sex differences in murder rates.
D) all of the above
Answer: D
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If John has schizophrenia, how likely is it that his dizygotic twin brother will also have schizophrenia?
a. John's brother will also have schizophrenia. b. There is a 38% probability that John's brother will have schizophrenia. c. There is an 18% probability that John's brother will have schizophrenia. d. John's brother will not have schizophrenia.