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Explain with an example the inheritance of dihybrid cross.How is it different from monohybrid cross? |
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Answer» Solution :The dihybrid cross involves the INHERITANCE of two PAIRS of contrast characteristics, round - yellow seeds and wrinkled - green seeds. When pea plants having round- yellow seeds cross BRED with pea plant having wrinkled - green seeds, in the FIRST generation `(F_1)` only round yellow seeds were produced No wrinkled - green seeds were obtained. Round yellow COLOUR seeds were dominant and wrinkled-green seeds were recessive. When round-yellow seeds were cross bred by self-pollination, four types of seeds havingdifferent combinations of shape and colour were obtained in `F_2` generation. They were round yellow , round green , wrinkled yellow , wrinkled green The phenotypic ratio in `F_2` generation is 9:3:3:1 i.e. 9-Yellow, round 3-Yellow , wrinkled 3-Green , round 1-Green, wrinkled 
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