Practice question

Dominance in Mendelian inheritance denotes allelic interaction wherein heterozygous phenotype mirrors one homozygous phenotype because one allele masks expression of another. Dominant allele often encodes functional protein sufficient at single dose, recessive allele may be loss-of-function or hypomorphic. Masking produces 3:1 ratio and explains why recessive traits skip generations. Both alleles expressing equally describes codominance such as AB blood group, blending suggests incomplete dominance, environmental effect unrelated to allele interaction at locus. Mastery ensures accurate interpretation of monohybrid and dihybrid progeny arrays, distinguishing dominance interactions from epistasis or linkage effects.