Practice question

Phenocopy describes environmentally induced phenotype that mimics genetically determined trait without change in genotype. Exposure to teratogenic drugs, temperature shift, nutritional deficiency, or chemical during critical developmental window can alter morphogenetic pathway producing trait similar to mutant. Resulting individuals are genetically wild type and offspring revert to normal when environment normalized, demonstrating non-heritability. Distinguishing phenocopies from true genetic mutants and from genocopies where different genotypes produce similar phenotype through genetic heterogeneity is essential for diagnosis, risk counseling, and accurate experimental genetic analysis.