what is a clade
A clade (from Ancient Greek: ÎºÎ»Î¬Î´Î¿Ï, klados, branch) is a group of organisms that consists of a common ancestor and all its lineal descendants, and represents a single branch on the  tree of life . A clade located within a clade is said to be nested within that clade. 2  In the diagram, the hominoid clade, the apes and humans, is nested within the primate clade. 3  Two clades are sisters if they have an immediate common ancestor.