Q.Match the following :

The correct matching is Dominant epistasis-12:3:1, Duplicate genes-15:1, Recessive epistasis-9:3:4, Complementary genes-9:7.

When two gene pairs interact non-additively to influence a single trait, the classic 9:3:3:1 dihybrid ratio is modified in characteristic, recognisable ways. In dominant epistasis, a dominant allele at one locus masks the expression of alleles at the second locus, merging two of the classes and giving a 12:3:1 ratio. In duplicate genes (duplicate dominant epistasis), either dominant allele alone (at either of two loci) is sufficient to produce the same dominant phenotype, so only a double-recessive genotype shows the alternative phenotype, giving a 15:1 ratio. In recessive epistasis, being homozygous recessive at one locus masks the phenotype normally determined by the second locus regardless of its genotype, producing a 9:3:4 ratio. In complementary gene action, two dominant genes from different loci must both be present together to produce a particular phenotype (such as flower colour in sweet …