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基因决定了你是左撇子还是右撇子

中等

高中三年级

说明文

现代科技

什么造就了左撇子？科学家第一次发现由于基因差异造就了这种不同的偏好。

For the first time, scientists have identified the genetic differences associated with left-handedness, a trait found in 10% of the human population. What's more, those genetic variants result in differences in brain structure, which might mean that left-handed people have better verbal skills than the right-handed majority.

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

The research could suggest a potential correlation between left-handedness and superior verbal skills, said Akira Wiberg, a Medical Research Council fellow at the University of Oxford who worked on the study. "This raises the possibility for future research that left-handers might have an advantage when it comes to performing verbal tasks," he said in a news release. Further research must be conducted to test this potential advantage, according to Gwenaëlle Douaud, joint senior author of the study. "We need to assess whether this higher coordination of the language areas between left and right side of the brain in the left-handers actually gives them an advantage at the verbal ability. For this, we need to do a study that also has in-depth and detailed verbal-ability testing," she said.

Funded by the UK's Medical Research Council and Wellcome, a UK medical research charity, the researchers studied the DNA of 400,000 people, including 38,332 left-handers, from the UK Biobank, a database comprising the health information of volunteers across the country.

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1 . What made the left-handed people have better verbal skills?

A.

The genetic variants.

B.

The previous research.

C.

The age differences.

D.

The brain development.

2 . How did the Oxford scientists separate the lefties from the righties.

A.

Studying the twins.

B.

Controlling the gene.

C.

Using the genes.

D.

Testing the language.

3 . The underlined phrase “this potential advantage” may refer to ______.

A.

the further study

B.

good verbal performance

C.

the great possibility

D.

the sports advantage

4 . What decided the coiling of the snail shells?

A.

The cytoskeleton.

B.

The microtubules.

C.

The right asymmetry.

D.

The health information.

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