Genetics and Twin Studies Quiz

What does "relatedness" refer to in genetic studies?

• Environmental similarity

• Genetic similarity between individuals

• Concordance rates in twins

• Heritability of traits

What is heritability?

• A genetic disorder

• The likelihood of inheriting a disease

• The measure of how much variation in a trait is due to genetics

• The environment's effect on genes

What does a concordance rate measure?

• The percentage of shared environments

• The likelihood that both twins share a specific trait

• Genetic inheritance probability

• The degree of environmental influence

What is the difference between monozygotic (MZ) and dizygotic (DZ) twins?

• MZ twins are genetically identical, while DZ twins share 50% of their genes.

• MZ twins share 50% of their genes, while DZ twins are genetically identical.

• MZ twins are siblings, while DZ twins are cousins.

• MZ twins always have the same gender, while DZ twins do not.

What did Johannes Lange (1929) find about criminal behaviour in twins?

• MZ twins had a higher concordance rate than DZ twins.

• DZ twins had a higher concordance rate than MZ twins.

• There was no difference between MZ and DZ twins.

• Only environmental factors influenced criminal behaviour.

What problem arises in twin studies due to shared environments?

• Ethical concerns

• Concordance rates

• Difficulty in separating genetic from environmental influences

• Limited data collection

Why are adoption studies useful in genetic research?

• They isolate environmental influences.

• They eliminate genetic influences.

• They combine genetics and upbringing.

• They focus on monozygotic twins only.

What did Hutchings and Mednick (1975) find in their study of adopted children?

• Environmental upbringing had no effect on behaviour.

• Children adopted from criminal parents often showed criminal tendencies.

• Genetics had no role in criminal behaviour.

• Concordance rates were identical for adopted and non-adopted children.

What is the "Warrior Gene" (MAOA) associated with?

• Increased intelligence

• Impulsive aggression and risk-taking behaviour

• Heightened empathy

• Enhanced memory

Which gene is linked to serotonin production?

• CDH13

• PET-1

• DRD4

• MAOA