Chimerism is what happens when cells from one twin are present in the other. For example, white blood cells with Y chromosomes would be found in the female twin. Vigier et. al, 1989.
Piaget's theory of cognitive development. Piaget's theory of cognitive development is a comprehensive theory about the nature and development of human intelligence. It was first created by the Swiss developmental psychologist Jean Piaget (1896â1980).
Summarize the stages of Piaget's theory of cognitive development. Jean Piaget developed his cognitive-developmental theory based on the idea that children actively construct knowledge as they explore and manipulate the world around them.