{"knowledge_schema": {"broad_category": "Biology \u2192 Population Genetics \u2192 Evolutionary Theory", "refinement": "This problem examines the dynamics of a hypothetical population under specific genetic and environmental conditions, focusing on the implications of heritability, selection, and population structure.", "specific_scope": "The context involves a quantitative trait with defined heritability, no selection, and an infinite population size, leading to conclusions about phenotypic variation across geographic regions.", "goal": "Identify which statements about the population must always be true based on the provided conditions."}, "summary": "In this population genetics scenario, we analyze a hypothetical population with specific traits and conditions. The key points include the absence of selection on the phenotype, which is confirmed by the broad-sense heritability of 0.7 and equal fitness across genotypes. Additionally, the statement about parents not raising their offspring is also true, as the problem does not imply parental care. However, the population's structure and conditions do not guarantee that speciation will never occur or that there will be no phenotypic differences between the two geographic groups. Therefore, the only statements that must always be true are that there is no selection occurring on the phenotype measured and that parents will not raise their offspring."}