Sort each design feature by the twin-study comparison it supports.
Groups: Compares identical vs fraternal twins · Studies identical twins raised apart
- A larger identical-fraternal similarity gap suggests a genetic contribution
- Any similarity cannot be explained by a shared upbringing
- Uses the 50% vs 100% gene-sharing difference
- Holds genes constant while environments differ
Hints
- One design contrasts two twin types; the other uses identical twins in different homes.
- 'Cannot be explained by shared upbringing' points to twins raised apart.
Show the answer
Compares identical vs fraternal twins: A larger identical-fraternal similarity gap suggests a genetic contribution, Uses the 50% vs 100% gene-sharing difference
Studies identical twins raised apart: Any similarity cannot be explained by a shared upbringing, Holds genes constant while environments differ
Comparing identical (100%) and fraternal (50%) twins uses their gene-sharing gap to estimate genetic contribution; studying identical twins raised apart holds genes constant while varying environment, so any similarity cannot be due to shared upbringing. The two designs provide complementary evidence.
Practise Nature vs. Nurture
The app has 6 more questions on this lesson, and keeps your place in the course. Psychology I is free to start.
More questions on Nature vs. Nurture
- Select every statement that is TRUE about behavioral genetics.
- A child with a genetic tendency toward reading ability is read to more, chooses more books, and is put in a…
- IQ heritability within a population is often estimated around 50-70%. Why does that figure say almost nothing…
- A heritability estimate of 50% within one population tells you that about half of any average difference…