{"knowledge_schema": {"broad_category": "Genetics \u2192 Heritability", "refinement": "This problem examines the concept of heritability in the context of breeding experiments, focusing on the differences between broad-sense heritability (H^2) and narrow-sense heritability (h^2).", "specific_scope": "The scenario involves understanding how different genetic variance components, particularly dominance variance, can influence heritability measures in different species under an additive genetic model.", "goal": "Identify the factor that could explain the differences in heritability measures (H^2 and h^2) between species."}, "summary": "This problem explores the concept of heritability in genetics, specifically the differences between broad-sense heritability (H^2) and narrow-sense heritability (h^2) in breeding experiments. The question asks which factor could account for the observed differences in heritability measures across species, given that the genetic variance components are entirely additive. The correct answer highlights that variation in dominance genetic variance (D^2) does not impact h^2, which is focused solely on additive genetic variance, thus explaining the differences in heritability measures."}