Realized Heritability: Definition

Correct Answer: Realized Heritability

From the notes: Realized heritability = Response to selection (R) / Selection differential (S). It is the heritability estimated from the actual genetic response achieved in a selection experiment.

Key Formulae (from notes)

• R = h²(realized) × S
• S = i × σP (i = intensity of selection, σP = phenotypic SD)
• R = i·h²·σP = i·σA·rAP

Distinction Between Heritability Types

• Narrow sense (h²N): VA/VP — regression of breeding value on phenotypic value
• Broad sense (H²B): VG/VP — ratio of genotypic variance to phenotypic variance
• Realized heritability: R/S — estimated from actual selection response ✔
• Narrow sense ≤ Broad sense always