But while left-handedness tends to run in families, neither left nor right handers will automatically produce off - spring with the same handedness ;

但是当惯用左手倾向在一个家庭里蔓延时，无论是左手或是右手都不会自动招致儿女也使用相同的手。

These are going to sound like they're coming out of left field but colorblindness left handedness?

听起来他们好像不在讨论范围之列 但色盲呢 左撇子呢？