段落1
This is Scientific American 60-Second Science. I'm Cynthia Graber.Got a minute?
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The term pygmy usually refers to a few groups of short-statured people in equatorial rain forest regions in Africa.
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The existence of distinct populations of such people presented scientists with the opportunity to study the mechanisms by which typical human growth patterns have become altered there.
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And they discovered that two groups became small in two different ways.
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The study is in the journal Nature Communications.
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The researchers collected data on some 500 members of a West African ethnic group called the Baka.
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They discovered that Baka infants have a similar size range to most other infants,
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but have a low growth rate during their first two years, which produces a lasting effect.
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This mechanism seems to be different from that of the East African groups called the Efe and Sua.
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These peoples have slow prenatal growth, so that the infants are born smaller.
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The researchers say that the Baka population appears to have split from the Efe and Sua some 20,000 years ago.
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The two different systems for achieving small stature,which appears to be advantageous in the equatorial rainforest environment are thus an example of convergent evolution.
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The researchers believe the findings say something important about human evolution and development in general:
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"Homo sapiens could therefore be characterized by its high capacity for growth plasticity during infancy.
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This capacity, which may be unique to our species, may have played a fundamental role in the biological adaptation that enabled its worldwide expansion and occupation of dissimilar environments within a short period after moving out of Africa."
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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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显示原文 =This is Scientific American 60-Second Science. I'm Cynthia Graber.Got a minute?
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2 / 16
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显示原文 =The term pygmy usually refers to a few groups of short-statured people in equatorial rain forest regions in Africa.
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3 / 16
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显示原文 =The existence of distinct populations of such people presented scientists with the opportunity to study the mechanisms by which typical human growth patterns have become altered there.
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4 / 16
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显示原文 =And they discovered that two groups became small in two different ways.
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5 / 16
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显示原文 =The study is in the journal Nature Communications.
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显示原文 =The researchers collected data on some 500 members of a West African ethnic group called the Baka.
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7 / 16
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显示原文 =They discovered that Baka infants have a similar size range to most other infants,
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8 / 16
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显示原文 =but have a low growth rate during their first two years, which produces a lasting effect.
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9 / 16
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显示原文 =This mechanism seems to be different from that of the East African groups called the Efe and Sua.
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10 / 16
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显示原文 =These peoples have slow prenatal growth, so that the infants are born smaller.
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11 / 16
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显示原文 =The researchers say that the Baka population appears to have split from the Efe and Sua some 20,000 years ago.
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12 / 16
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显示原文 =The two different systems for achieving small stature,which appears to be advantageous in the equatorial rainforest environment are thus an example of convergent evolution.
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13 / 16
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显示原文 =The researchers believe the findings say something important about human evolution and development in general:
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14 / 16
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显示原文 ="Homo sapiens could therefore be characterized by its high capacity for growth plasticity during infancy.
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15 / 16
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显示原文 =This capacity, which may be unique to our species, may have played a fundamental role in the biological adaptation that enabled its worldwide expansion and occupation of dissimilar environments within a short period after moving out of Africa."
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16 / 16
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显示原文 =Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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- 单句循环：关
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞