What does "nature" refer to in the nature vs nurture debate?
A: The influence of family upbringing on personality
B: Genetic and biological factors that shape who we are
C: The natural environment we live in
D: Experiences we have in childhood
Correct: Genetic and biological factors that shape who we are
"Nature" refers to our genetic inheritance — the traits, tendencies, and biological characteristics we are born with. "Nurture" refers to everything outside our genes: upbringing, culture, experiences, relationships, and environment. Both influence who we become, and modern psychology focuses on understanding how they interact rather than arguing that one is more important.
Why are studies of identical twins raised apart considered especially valuable to psychologists?
A: Because they show that environment has no effect on behaviour
B: Because they allow researchers to separate the effects of genetics from environment
C: Because twins always have identical personalities
D: Because they are easier to study than non-twins
Correct: Because they allow researchers to separate the effects of genetics from environment
Identical twins share nearly 100% of their DNA. When identical twins are raised in different families and environments, any similarities between them are likely due to genetics, while differences can be attributed to environment. Famous twin studies, such as the Minnesota Study of Twins Reared Apart, found striking similarities in personality, intelligence, and even specific habits — suggesting a stronger genetic influence than many expected.
Intelligence is entirely determined by genetics and cannot be changed by education or environment.
Answer: False
While intelligence has a significant heritable component (twin studies suggest genetics account for 50–80% of variation in IQ), environment plays a substantial role too. Growing up in poverty, having limited access to education, poor nutrition, and high stress all reduce cognitive development. Conversely, stimulating environments, good schooling, and early intervention can meaningfully improve cognitive outcomes. The gene–environment interaction is complex.
Which of the following best represents the modern view in psychology on nature vs nurture?
A: Genes are far more important than environment for most traits
B: Environment is far more important than genes for most traits
C: Genes and environment constantly interact, and neither can be understood in isolation
D: The debate has been settled: nature wins
Correct: Genes and environment constantly interact, and neither can be understood in isolation
Modern psychology has moved far beyond the old nature-or-nurture framing. Genes influence how we respond to environments, and environments influence how genes are expressed (a field called epigenetics). A person with a genetic risk for depression may never develop it in a supportive environment; someone without that risk might develop it under severe stress. Nature and nurture are deeply intertwined.
Just because a behaviour runs in families, that proves it is genetic.
Answer: False
Families share both genes and environments — so a behaviour appearing across generations could be due to genetics, shared upbringing, cultural transmission, or a combination of all three. For example, poverty tends to run in families, but this is far more about social and economic circumstances than genes. Disentangling genetic from environmental contributions requires careful research designs like twin or adoption studies.
What is epigenetics?
A: The study of genetics before birth
B: Changes to how genes are expressed caused by environmental factors, without altering the DNA itself
C: The process by which children inherit their parents' memories
D: Genetic mutations caused by stress
Correct: Changes to how genes are expressed caused by environmental factors, without altering the DNA itself
Epigenetics refers to changes in gene expression — whether a gene is "switched on" or "off" — that are caused by environmental experiences rather than changes to the DNA sequence itself. Stress, diet, trauma, and early experiences can all leave epigenetic marks. Some of these marks can even be passed to the next generation, meaning your parents' experiences may influence your biology in ways that go beyond standard inheritance.