Đáp án phần 2
If your father was left-handed but your mother was right-handed, you have a 17% …(11)…chance of being born left-handed, while two righties will have a left-handed child only 10% of the time. Handedness seems to be …(12)…determined by a roll of the dice, but the odds are set by your genes.
All of this implies there's a reason that …(13)…evolution has produced this small proportion of lefties, and maintained it over the course of millennia. And while there have been several theories attempting to …(14)…explain why handedness
exists in the first place, or why most people are right-handed, a …(15)…recent mathematical model suggests that the actual ratio reflects a …(16)…balance between competitive and cooperative pressures on human evolution.
The benefits of being left-handed are clearest in activities involving an opponent, like combat or competitive …(17)…sports. For example, about 50% of top hitters in …(18)…baseball have been left-handed. Why? Think of it as a …(19)…surprise advantage. Because lefties are a minority to begin with, both right-handed and left-handed competitors will spend most of their time encountering and practicing against righties. So when the two …(20)…face each other, the left-hander will be better …(21)…prepared against this right-handed opponent, while the righty will be thrown off.
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