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  4. The phenotypic ratio obtained in quantitative inheritance of a dihybrid cross is :

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Q. The phenotypic ratio obtained in quantitative inheritance of a dihybrid cross is :

Delhi UMET/DPMTDelhi UMET/DPMT 2004

Solution:

Multiple factor inheritance (polygenic inheritance or quantitative inheritance) implies that several pairs of alleles are interacting and that each has a similar and measurable effect on the characteristic. Experimental evidence for polygenic inheritance was first obtained by a Swedish geneticist. H. Nilsson Ehle in 1908. He found that kernel colour in wheat is determined by three gene pairs. The phenotypic ratio in quantitative inheritance of a dihybrid cross will bel: $4 : 6 : 4 : 1. 1 : 2 : 1$ is the phenotypic ratio of incomplete dominance in Mirabilis jalapa. $9 : 3 : 3 : 1$ is the dihybrid phenotypic ratio or law of independent assortment.