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).
Theories of human development. 1. THEORIES OF HUMAN DEVELOPMENT. FREUD'S PSYCHOSEXUAL THEORIES, ERIKSON'S PSYCHOSOCIAL THEORIES, LEARNING THEORIES, PIAGET'S THEORY OF COGNITIVE DEVELOPMENT, KARL JUNG, MASLOW. 2. THEORIES OF HUMAN DEVELOPMENT ï¢ Theories of development provide a framework for thinking about human growth, development, and learning.