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Hox genes and evolution

Your Hox genes are very similar to those of other animals - even a fruit fly's. Hox genes have remained much the same during animal evolution, because they are so important. Even a slight change in a single Hox gene could have a drastic effect on an animal's body. Different animals may have evolved in this way, for example, snakes may have evolved from lizards by losing the Hox gene for making legs.

Snakes may have evolved from lizards through changes in Hox genes.
Snakes may have evolved from lizards through changes in Hox genes.
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