A) 9 : 3 : 3 :1
B) 1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1
C) 7 : 1 : 1 : 7
D) 12 : 8 : 4
Correct Answer: A
Solution :
A dihybrid cross involves two pairs of contrasting characters, eg, yellow round seeded plant and wrinkled green seeded plant (both pure lines) homozygous. When a dihybrid cross is made between two pure line of homozygous parents, then the F, generation shows hybrids with dominant phenotypic effect. When \[{{F}_{1}}\]heterozygous plants are self-fertilized to produce \[{{F}_{2}}\]generation, 4 types of combinations are obtained of which two are similar to parental combination and other two are new combinations. The phenotypic dihybrid ratio of these 4 combinations in \[{{F}_{2}}\] generation comes out to be 9 : 3 : 3 : 1, while the genotypic dihybrid ratio is 1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1.
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