Theory 02/Refinement
Heritability Depends on Variance
The claim
Heritability is higher in uniform environments, because it is the share of variance, so eliminating environmental variance raises it.
01Mechanism
Heritability is a ratio; reducing the denominator raises it without any genetic change.
02Prediction
Heritability should rise where environments are equalised.
03Refutation
Heritability constant across environmental variance would remove the ratio.