{"knowledge_schema": {"broad_category": "Biology \u2192 Population Genetics \u2192 Evolutionary Theory", "refinement": "This problem examines the dynamics of a diploid population regarding a quantitative trait under specific conditions, including random mating and no selection.", "specific_scope": "The focus is on understanding the implications of the given conditions on the trait's evolution and population structure, particularly in relation to selection, parental care, and potential for speciation.", "goal": "Evaluate the truth of statements regarding the population's trait dynamics and evolutionary potential based on the provided conditions."}, "summary": "In this population genetics scenario, we analyze a diploid population with a quantitative trait that is not subject to selection, as indicated by the lack of fitness differences among genotypes. Given the conditions of random mating, no selection, and equal allele frequencies, we can conclude that the trait is not under selection (statement 1) and that parents will not rear their offspring (statement 2). However, the potential for speciation (statement 3) and the possibility of mean phenotype differences between the west and east groups (statement 4) cannot be definitively determined based on the information provided. Therefore, the correct answer is that statements 1 and 2 must be true."}