prompt: What are the genetic and environmental factors that contribute to left-handedness, and how does the percentage of left-handed individuals differ globally?
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chosen.content: What are the genetic and environmental factors that contribute to left-handedness, and how does the percentage of left-handed individuals differ globally?
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chosen.content: Left-handedness is a complex trait that appears to be influenced by multiple genetic and environmental factors. Research suggests that handedness is not determined by a single gene but rather by a complex interaction of genetic factors. For instance, a study published in the journal "Brain" in 2019 identified four genetic regions that may influence left-handedness, one of which is involved in brain symmetry. On the environmental side, prenatal factors such as exposure to hormones in the womb might affect handedness. There's also some evidence suggesting that birth stress could potentially influence a shift to left-handedness.
  
  The percentage of left-handed individuals varies somewhat across different cultures and societies but is generally estimated to be around 10%. There's ongoing research investigating whether cultural attitudes towards left-handedness might influence the prevalence rates reported in different societies. 
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rejected.content: A chat.
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rejected.content: What are the genetic and environmental factors that contribute to left-handedness, and how does the percentage of left-handed individuals differ globally?
rejected.role: assistant