Traits & health
What genes influence, and how much.
Questions
Key terms
- Epigenetics
- Changes in which genes are switched on or off, without changing the DNA itself.
- Heritability
- How much of the variation in a trait across people is explained by genes.
- Polygenic
- A trait or risk shaped by many genes together, each with a small effect.
- Phenotype
- The observable result — your traits, how the genes actually show up.