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2026-09-29

AP Psych Zero: How Do You Tell Heredity From Environment?

AP Psych Zero
AP Psych Zero@Teddy Thang
AP Psych Zero: How Do You Tell Heredity From Environment?

Two kids grow up in the same house. Same meals, same school district, same two parents. By the time they finish high school, they have the same laugh and the same habit of tapping the table while they think.

0:00 / 7:36
This episode opens Unit 1, Biological Bases of Behavior, with its first topic: when a trait runs in a family, which part of that family put it there — the genes or the life.

What you will learn

  • What heredity and environment name in the course framework, and what "they interact" actually claims.
  • Why a family resemblance on its own cannot separate the two.
  • How twin studies, adoption studies, and family studies break that pairing, and what each design can conclude.
  • What the framework's twin item on anorexia nervosa is allowed to say, and what it is not.
  • How the evolutionary and biological perspectives frame a heredity question — and why the framework flags eugenics as a misuse of evolutionary ideas.

Learning map

DesignHeld roughly steadyLeft free to varyStrongest claim it supports
Twin studyThe home both kinds of pairs grow up inHow much genetic material a pair sharesHeredity appears correlated with the trait
Adoption studyThe genes a child bringsThe home that raised the childWhether the trait tracks the biological or the adoptive family
Family studyNothingBoth the genes and the surroundingsThat the trait runs in this family — not why
The worked example is the framework's own twin item: thirty pairs of female twins, sixteen identical and fourteen fraternal, in which nine identical pairs and one fraternal pair had both twins diagnosed with anorexia nervosa.

Study check

Answer these without replaying the final minutes:
  1. Why can a family resemblance not tell you whether a trait is hereditary?
  2. What is held steady in a twin study, and what is left to vary?
  3. Why can an adoption study point at genes in a way a family study cannot?
  4. In the framework's twin item, what is the strongest conclusion the data support?
  5. Why could that study not be run as an experiment?
  6. Which perspective would best help researchers answer a question about heredity and environment?
The habit to carry out of this episode: name who is being compared with whom, say which side the design held still, and check the verb in the conclusion — correlated, or caused.

Scope and sources

The College Board's Course and Exam Description defines heredity as genetic or predisposed characteristics and environment as the external factors a person experiences, such as family interactions or education, and states that heredity and environmental factors interact to shape behavior and mental processes. The same section places genotypes, phenotypes, DNA, chromosomes, and dominant and recessive gene expression beyond the scope of the exam, and names twin studies, family studies, and adoption studies as the designs used to study the effects of genes on behavior and mental processes. 1
The twin item used in this episode is printed in that document's Exam Information section among its sample multiple-choice questions, which credits it to Holland, Hall, Murray, Russell, and Crisp (1984), "Anorexia nervosa: a study of 34 twin pairs and one set of triplets," British Journal of Psychiatry, 145, 414–419. The AP Psychology course page describes the science practices the course is built around. 2
This episode is a study aid. Use your teacher's current materials and the current College Board framework for course-specific assignments and exam details.

References

  1. 1
    AP Psychology Course and Exam Description — College Board

    apcentral.collegeboard.org

  2. 2
    AP Psychology Course — AP Central, College Board

    apcentral.collegeboard.org

AP Psych Zero
AP Psych Zero@Teddy Thang

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