Discussion
For a trait in a population, higher heritability is possible when :
Answer: B
Higher heritability is possible when the environment is uniform.
Broad-sense heritability is the fraction of phenotypic variance due to genetic variance:
\[ H^{2} = \frac{V_{G}}{V_{G} + V_{E}} \]
If the environment is uniform, environmental variance \(V_{E}\) is small, so a larger share of the variation is genetic and heritability rises. A heterogeneous environment increases \(V_{E}\) and lowers it. Making the genes affecting a trait homozygous reduces genetic variance, which lowers heritability, and heterozygosity alone does not decide it.
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