Humans carry all of the genes necessary to develop a tail but we typically don't develop tails because those genes are never activated.

Question

Quizplus · Accepted Answer

Humans have remnants of a tailbone (coccyx), which is evidence that our ancestors had tails. However, over time, the genes responsible for tail development were deactivated through a combination of mutations and selective pressures. Nonetheless, the genetic code for developing a tail remains in the human genome.

Humans Carry All of the Genes Necessary to Develop a Tail