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Phobias

Identical twins have identical genes - and they often share phobias and irrational fears, even when brought up in different families. This suggests that these kinds of behaviours are partly influenced by our genes, as well as by the experiences we have during our lives. A 1998 study found that our genes also influence our tendency to suffer nightmares, though experiences are important here too.

Identical twins often share phobias.
Identical twins often share phobias.
Corbis

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