Repeatability Possible Value When Heritability is Known

Correct Answer: 0.45

From the notes: Repeatability is the upper limit of heritability — meaning repeatability ≥ heritability always.

Logic

• If heritability = 0.3, then repeatability must be ≥ 0.3
• Options 0.25, 0.05, and 0.15 are all LESS than 0.3 — impossible
• 0.45 > 0.3 → this is the only possible value ✔

Why Repeatability ≥ Heritability?

r = (VG + EP) / VP, while h²B = VG / VP. Since VG + EP ≥ VG, we have r ≥ H²B ≥ h²N. Range of both: 0 to +1.

Sample Question (from notes)

If repeatability = 0.30, the value 0.45 is NOT possible for heritability — because heritability CANNOT exceed repeatability.