2018年2月14日 · Human DNA is too similar to split us into subspecies, or into “races.” So we can't use biology to sort people into groups like we can with other animals. Can we group people based on physical appearance?

2016年1月12日 · Some organs are very different between humans and insects, like the heart. On the left is a human 4-chambered heart (just after a heart transplant) and on the right is the enlarged image of a long thin tube heart in a beetle. Human heart image by Vasily I. Kaleda; beetle heart by the Harrison lab. The human liver removes toxins from the body.

2011年8月19日 · Instead of human diversity arising from a few different areas on the gene, the way we look is regulated by hundreds of different weak genes that interact to make us unique! Dogs may have fewer areas of diversity compared to humans because of what scientists call a gene bottleneck.

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Be Part of Ask A Biologist. By volunteering, or simply sending us feedback on the site. Scientists, teachers, writers, illustrators, and translators are all important to the program.

2009年9月29日 · These kids have the exact same DNA, which is exactly what a clone is. Yes, we already have human clones walking among us! Amazing right? Perhaps you know some identical twins? If you do, you might know that they might look the same, but they are very unique people in many ways. That is why a clone of you might not be you at all in the end.

**Some of the content on this page is out of date, please pardon us while we update it for accuracy.**Below is a list of phenotypes easily identified in humans that follow the pattern of Mendelian inheritance.

Be Part of Ask A Biologist. By volunteering, or simply sending us feedback on the site. Scientists, teachers, writers, illustrators, and translators are all important to the program.

Sometimes, though, human chimeras don’t have any visible signs. Lydia Fairchild did not have any obvious marks on her body. She likely would never have known about her condition if she didn’t submit her DNA to the government. Chimerism in History. Lydia Fairchild was not the first human chimera scientists discovered.

A house burglar is caught in the act and in a panic grabs a heavy paperweight from a desk and hits the home owner on the head, accidentally killing him. Fearing he will be caught, he races out of the house but trips over a display of blooming tropical plants in the hallway.