科学家首次发现了与左撇子有关的遗传差异，人类中10%的人发现有左撇子性状。

更重要的是，这些基因变异导致大脑结构的差异，这可能意味着左撇子比右撇子拥有更好的语言技能。

While previous research into twins has indicated that genes are at least partially responsible for controlling handedness, the new study, conducted by scientists from the University of Oxford and published in the journal Brain, is the first to identify which genetic variants separate the lefties from the righties.

Scientists have identified the genes linked to left-handedness

https://edition.cnn.com/2019/09/05/health/uk-left-handed-genes-brain-structure-scn-scli-intl/index.html

Genetic Regions Associated With Left-Handedness Identified

Journal Reference:

1. Akira Wiberg, Michael Ng, Yasser Al Omran, Fidel Alfaro-Almagro, Paul McCarthy, Jonathan Marchini, David L Bennett, Stephen Smith, Gwenaëlle Douaud, Dominic Furniss. Handedness, language areas and neuropsychiatric diseases: insights from brain imaging and genetics. Brain, 2019; DOI: 10.1093/brain/awz257