When An Arm is Really a Leg | DNA Science Blog

See on Scoop.itIB Biology

A homeotic mutation mixes up body parts, so that a fly grows a leg on its head or antennae on its mouth. Assignment of body parts begins in the early embryo, when cells look alike but are already fated to become what they will become, thanks to gradients of “morphogen” proteins that program a particular region to elaborate particular structures. Mix up the messages, and a leg becomes an antenna, or an elbow a knee.

See on blogs.plos.org

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