Absence of racial, but not gender, stereotyping in Williams syndrome children

How does the levels of selection question relate to the ‘major evolutionary transitions’? Such transitions, as defined by Eörs Szathmáry and John Maynard Smith, occur when free-living biological units, capable of surviving and reproducing alone, coalesce into a single larger unit, giving rise to a new, higher-level individual — for example, in the evolution of multicelled organisms from single-celled ancestors. In transitions of this sort, there is the potential for selection to act on both the smaller and the larger units — the individuals and the groups. For the groups to evolve into ‘real’ individuals, i.e. integrated cohesive units, group-level selection must trump individuallevel selection. So multiple levels of selection are intimately involved with evolutionary transitions.