Researchers Have Had Trouble Replicating Studies That Found a Particular

Multiple Choice

 Researchers have had trouble replicating studies that found a particular gene linked to schizophrenia. According to one recent hypothesis, ____.

A) genes in fact have nothing to do with schizophrenia
B) the same genes responsible for schizophrenia also produce Huntington's disease
C) spontaneous mutations in any of hundreds of genes can cause schizophrenia
D) most genetic researchers fail to examine the X and Y chromosomes