Since the rediscovery of Mendel’s laws, it has been common to talk about genes for xx, where xx could be feeblemindedness, IQ, sports ability, procrastination, homosexuality, divorce, crime, fidelity, conservatism, liberalism, schizophrenia,… (You choose xx; see what you get when yougoogle “Is there a gene for xx.”)
There are manycomplications, including
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Whys To Look For Genes: Pros and Complications 