Human Growth and Development / Unit 1 HGD 0040 short lesson, about 20 seconds
Twin Studies
Captions available
The idea
Twin studies compare identical twins, who share close to one hundred percent of their genes, with fraternal twins, who share about fifty percent.
In practice
Identical pairs and fraternal pairs measured on the same trait, then compared.
Where people slip
Fraternal twins share genes like other siblings but share more environment than siblings born years apart, which is why the two kinds are compared.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
- Nothing yet depends on this.
Something wrong in this lesson? Flag it · Sources for Human Growth and Development