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Question

During dihybrid cross in the F2 generation, the ratio of individuals showing one dominant and other recessive character will be ________ of parents with contrasting characters.

A
4/16
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B
6/16
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C
8/16
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D
9/16.
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Solution

The correct option is B 6/16

In a dihybrid cross, a plant with yellow colour round seeds(YYRR) is crossed to green colour wrinkled(yyrr) seeds. In the F1 generation, plant with yellow colour wrinkled seeds(YyRr) are formed. When F1 plant is subjected to self pollination, in the F2 generation 1YYRR, 2 YYRr, 2YyRR, 4YyRr, 1YYrr, 2Yyrr, 1yyRR, 2yyRr, 1yyrr are formed genotypically and 9 plants are Yellow round, 3 plants are yellow wrinkled, 3 plants are green round and 1 plant is green wrinkled are formed phenotypically.

So, the correct option is ‘6/16’
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