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Gene interaction, feedback, GROUP NO : 5, types, discovery, supplementary…

- - - - incomplete dominance a) monohybrid (1:2:1) partial dominance b)dihybrid (1:2:1:2:4:2 :1:2:1) partial dominance at both gene pair.
      - lethal factor (2:1 or 3:0) homozygous condition cause death.
      - multiple alleles occurence of more than two alleles.
      - supplementary gene interaction (9:3:3:1`) dominant allele of one gene is essential for the development of concerned phenotype while other gene modifies the expression of other gene.
      - complemntary gene interaction (9:7) complementation b/w two non-allelic genes are essential for production of particular phenotype.
- - - - epistatic gene interaction (12:3: 1) out of two gene dominant allele A of one gene mask the effect of other gene B.
        
        types
        
        Dominant epistasis (12:3:1) dominant gene is epistatic to the other gene
        
        recessive epistatsis ( 9:3:4) a homozygous recessive gene is epistatic to other gene.