Assertion (A):in a monohybrid cross f1 generation indicate dominant characters. Reason(R):dominance occurs only in heterogeneous state a)both A and R are true and Ris the correct explanation of A. b)both A and R are true but R is not the correct explanation of A. c)A is false but R is true. d) A is true but R is false.
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Answer:
b is the answer
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The correct option is d) A is true but R is false.
Assertion (A): In a monohybrid cross f1 generation indicate dominant characters.
A Monohybrid cross is a cross in which both the parents have homogeneous genotype, i.e. AA or aa.
If monohybrid cross is performed, then genotype of f1 generation is shown in the Punnett square below:
B B
b Bb Bb
b Bb Bb
As seen from above, all the offspring of the f1 generation will have a heterogeneous genotype. In a heterogeneous genotype, the dominant trait will be portrayed.
Thus, we can say that in a monohybrid cross, f1 generation will indicate dominant characters.
Reason(R): Dominance occurs only in heterogeneous state.
Dominance occurs not only in the heterogeneous state but in the homogenous state as well.
Thus, the above statement that dominance occurs only in heterogenous is not correct.