Traits acquired during one's lifetime - muscles built up in the gym, for example - cannot be passed on to the next generation. Now with technology, as it happens, we might indeed be able to transfer some of our acquired traits on to our selected offspring by genetic engineering.
Nick BostromRelated topics
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Genes do indirectly control the manufacture of bodies, and the influence is strictly one way: acquired characteristics are not inherited. No matter how much knowledge and wisdom you acquire during your life, not one jot will be passed on to your children by genetic means. Each new generation starts from scratch.
Richard Dawkins