The causes of Individual differences among children are

Concept: Developmental psychologists explain individual differences through the interactionist perspective: differences among children in traits such as intelligence, personality, aptitude, and behaviour arise from the continuous interplay of heredity (genetically inherited factors) and environment (external influences such as upbringing, nutrition, culture, and education). Neither factor operates alone; each shapes, and is shaped by, the other throughout development.

Application: In this item, the described “causes of individual differences among children” cannot be reduced to a single source. Genetic inheritance contributes traits such as physical characteristics, temperament, and certain aptitudes, while environmental experience contributes learning opportunities, social conditioning, nutrition, and cultural context. Because both classes of factors are simultaneously at work, the causes are correctly described as heredity and environment acting together.

Cross-check:

• Attributing the differences to heredity alone would leave variations linked to upbringing, schooling, and culture unexplained.

• Attributing the differences to environment alone would leave variations linked to inherited traits and genetic predisposition unexplained.

• Denying both factors any role would contradict the well-documented influence each has on development, so neither can be excluded.

Result: The causes of individual differences among children are therefore both heredity and environment, consistent with the interactionist view held across developmental and educational psychology.