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1.1 Interaction of Heredity and Environment

Syllabus
2025
Topic
1.1
Level
—

Learning objectives

1.1A—Explain the relationship between heredity and environment in shaping behavior and mental processesExplain the relationship between heredity and environment in shaping behavior and mental processes.• Heredity and environmental factors interact to shape behavior and mental processes.- i. Heredity, or “nature,” refers to genetic or predisposed characteristics that influence physical, behavioral, and mental traits and processes.- ii. Environmental factors, or “nurture,” refers to the external factors that one experiences, such as family interactions or education.- Exclusion: Specific information about genetics (genotype, phenotype, DNA, chromosomes, and recessive and dominant gene expression) is beyond the scope of the AP Psychology Exam.• The evolutionary perspective explores how natural selection affects the expression of behavior and mental processes to increase survival and reproductive success. Some theorists have sought to apply principles of the evolutionary perspective in ways that discriminate against others (eugenics).• Research on the effects of genes on individual behavior and mental processes is often conducted using twin studies, family studies, and adoption studies.

Nature and Nurture Work Together

Behavior and mental processes are shaped by an interaction between heredity and environment. Heredity supplies genetic or predisposed characteristics; environment supplies experiences such as family interactions and education. The key idea is not ‘nature or nurture’: an inherited tendency can be strengthened, reduced, or expressed differently under different environmental conditions.

Part of the explanation What it means
Heredity (nature) Inherited or predisposed characteristics that can influence physical, behavioral, and mental traits
Environment (nurture) External experiences and conditions that influence development and behavior
Interaction The effect of one can depend on the other; neither alone provides a complete explanation

A person may have a predisposition toward a characteristic, while education, family experience, or another environmental condition affects how strongly it appears. Psychologists compare twins, biological relatives, and adopted family members to estimate how heredity and shared or different environments relate to behavior. These designs reveal patterns of association; they do not prove that one gene or one experience is the sole cause. The evolutionary perspective adds a population-level explanation: natural selection can favor behavioral tendencies that increased survival or reproductive success.

Exam boundary: AP Psychology does not require details of genotype, phenotype, DNA, chromosomes, or dominant and recessive gene expression. Also avoid treating evolutionary explanations as moral approval; discriminatory applications such as eugenics are harmful misuses of evolutionary ideas.