Question

An elongated tailbone occurs rarely in some newborn children. What does the presence of a tailbone indicate?

Answer 1

It's because the genome has undergone mutation which means the foetus has a post anal tail and when the fetus matures the genome triggers absorption in development to remove unnecessary components by disintegrating the unnecessary cells (webbing, tail, etc). When this is not removed it is because the genome did not send the signal for absorption.