Practice question

Purpose of reciprocal cross is to test sex linkage versus autosomal inheritance. Swapping male and female parental phenotypes, such as tall female by dwarf male versus dwarf female by tall male, yields identical results for autosomal genes because transmission independent of parental sex. For X-linked genes results differ due to hemizygous male inheritance and dosage, revealing criss-cross pattern. Gene purity assessed by test cross, independent assortment by dihybrid ratio, mutation rate not addressed, reciprocal design specifically diagnoses sex-linked transmission. Understanding this mechanism aids pedigree analysis, Punnett predictions, linkage mapping and appreciating evolutionary conservation across taxa.