Why are some people more likely to be left-handed?
Quick Answer
Left-handedness is influenced by a mix of genetics, brain development, and prenatal factors. It is not controlled by a single gene, and about 10% of people are left-handed.
The Full Story
Hand preference appears early in life and is shaped by multiple factors. Family studies show that handedness has a genetic component, but no single gene determines it completely. Brain lateralization, prenatal development, and perhaps environmental influences all contribute. In most countries, about 1 in 10 people are left-handed, and the trait is less common in older generations partly because left-handed children were sometimes trained to use the right hand.
Key Facts
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"Why one in ten people is left-handed"
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