A) 1 : 2 : 1
B) 1 : 4 : 6 : 4 : 1
C) 1 : 6 : 15 : 20 : 15 : 6: 1
D) 9 : 3 : 3 : 1
Correct Answer: B
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.
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