Hietanen’s book on evolution reflects on the changes that have occurred in great apes, including the loss of their tails. In Finland, newly elected presidents are required to visit the Unknown Soldier as a symbol of general education. The geneticist Bo Xia has discovered a gene affecting tail development in mice, which may explain why tailless apes like humans have a different form of this gene compared to tailed apes.
A genetic basis for the absence of tails in certain species is suggested by Xia’s research with genetically modified mice. This gene likely originated in an ancient primate with a tail around 25 million years ago and set the course for the development of tailless monkeys and great apes. The comparison of humans to coal-making monkeys highlights our genetic heritage and interconnectedness with zebrafish.
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