Genetic GPS system of animal development explains why limbs grow from torsos and not heads

Animals in the same species usually share the same symmetry. Humans and goats have bilateral symmetry, meaning they can be divided into halves that are mirror images of each other. Credit: CNX OpenStax/Wikimedia Commons, CC BY 4.0

Why do human look like humans, rather than like chimps? Although we share 99% of our DNA with chimps, our faces and bodies look quite different from each other.

While human body shape and appearance have clearly changed…

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