Assume that researchers have found a recessive gene for schizophrenia and that Al's father carries that recessive gene, whereas Al's mother does not. What is the probable outcome for Al with respect to schizophrenia?

a) Al will not develop schizophrenia.
b) Al will definitely develop schizophrenia.
c) Al has a 25 percent chance of developing schizophrenia.
d) Al has a 50 percent chance of developing schizophrenia.

a