Practice question

Reciprocal crosses swap sexes of parental phenotypes, for example tall female crossed to dwarf male versus dwarf female to tall male. For autosomal genes, transmission pattern depends solely on nuclear genotype, not parental origin, inheritance shows identical progeny ratios in both directions. This equality holds because autosomes segregate similarly in oogenesis and spermatogenesis. Discrepancy between reciprocals signals sex-linked inheritance, imprinting or cytoplasmic maternal effect, thus reciprocal analysis distinguishes autosomal from sex-linked or organellar modes. Understanding this mechanism aids pedigree analysis, Punnett predictions, linkage mapping and appreciating evolutionary conservation across taxa.