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  4. The polygenic genes show :

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Q. The polygenic genes show :

Haryana PMTHaryana PMT 2000

Solution:

Polygenic (or Quantitative) inheritance is that type of inheritance in which the complete expression of a trait is controlled by two or more genes in which a dominant allele of each gene contributes only a unit raction of the trait and total phenotypic expression is the sum total of a additive or cumulative effect of all the dominant alleles of genes/polygenes. Human skin colour is an example of such polygenic inheritance which is controlled by three pairs of polygenes $A, B$ and $C$. Negro/black colour is due to presence of all the six dominant contributing alleles $AABBCC$. Very light colour or white colour is due to presence of all six recessive noncontributing alleles $aabbcc$.