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Do Japanese have Neanderthal genes?

Researchers also have found a peculiar pattern in non-Africans: People in China, Japan and other East Asian countries have about 20 percent more Neanderthal DNA than do Europeans.

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As a result, Neanderthal DNA became progressively rarer in living humans. Dr. Sankararaman and his colleagues proposed that it disappeared faster in Europeans than in Asians. The early Asian population was small, the researchers suggested, and natural selection eliminates harmful genes more slowly in small groups than in large populations. Today, smaller ethnic groups, like Ashkenazi Jews and the Amish, can have unusually high rates of certain genetic disorders. Joshua M. Akey, a geneticist at the University of Washington, and the graduate student Benjamin Vernot recently set out to test this hypothesis. They took advantage of the fact that only some parts of our genome have a strong influence on health. Other parts — so-called neutral regions — are less important. A mutation in a neutral region won’t affect our odds of having children and therefore won't be eliminated by natural selection. If Dr. Sankararaman’s hypothesis were correct, you would expect Europeans to have lost more harmful Neanderthal DNA than neutral DNA. In fact, the scientists did not find this difference in the DNA of living Europeans. Dr. Akey and Mr. Vernot then tested out other possible explanations for the comparative abundance of Neanderthal DNA in Asians. The theory that made the most sense was that Asians inherited additional Neanderthal DNA at a later time. In this scenario, the ancestors of Asians and Europeans split, the early Asians migrated east, and there they had a second encounter with Neanderthals. Dr. Akey and Mr. Vernot reported their findings in the American Journal of Human Genetics. Dr. Lohmueller and the graduate student Bernard Y. Kim approached the same genetic question, but from a different direction. They constructed a computer model of Europeans and Asians, simulating their reproduction and evolution over time. They added some Neanderthal DNA to the ancestral population and then watched as Europeans and Asian populations diverged genetically. The scientists ran the model many times over, trying out a range of likely conditions. But no matter which variation they tried, they couldn’t find one explaining why Asians today have extra Neanderthal DNA.

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Do men grow until 25?

Although some men may continue to grow in their 20s, most men's growth plates are closed by 21 years. Hence, it is unlikely for men to grow after 21 years, with some exceptions. In a healthy growth pattern, your bone increases in length due to the growth plates in the bone called epiphyses.

Although it is hard to increase your height as an adult, there are ways by which you can maximize your height during your teenage years. Although some men may continue to grow in their 20s, most men’s growth plates are closed by 21 years. Hence, it is unlikely for men to grow after 21 years, with some exceptions. In a healthy growth pattern, your bone increases in length due to the growth plates in the bone called epiphyses. During puberty, your epiphyses mature, and at the end of puberty, they fuse and stop growing.

Growth stops in the following order:

Hands and feet stop growing

Arms and legs stop growing

The spine growth stops

Once the epiphyses fuse, the person’s height does not increase anymore. A person's growth is controlled by growth hormone, thyroid hormone, and sex hormones such as testosterone and estrogen.

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