Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : If starch grain size is considered as phenotype, then Bb genotype will show incomplete dominance.
Reason (R) : Pea plant having BB genotype produces large sized starch grains, Bb genotype produces intermediate sized starch grains and bb genotype produces small sized starch grains.
In the light of the above statements, choose the correct answer from the options given below.

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(A) is true but (R) is false

(A) is false but (R) is true

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

answer is D.

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Detailed Solution

The assertion is true. Incomplete dominance occurs when the heterozygous phenotype is intermediate between the phenotypes of the two homozygotes. If starch grain size is considered a phenotype, and Bb genotype produces intermediate-sized starch grains between the large-sized grains of BB genotype and the small-sized grains of bb genotype, it indicates incomplete dominance.
The reason provides evidence supporting Assertion (A). It describes the pattern of starch grain sizes produced by different genotypes in pea plants, with BB genotype producing large-sized starch grains, Bb genotype producing intermediate-sized starch grains, and bb genotype producing small-sized starch grains. This pattern is consistent with incomplete dominance.
Therefore, Assertion (A) is supported by Reason (R), making both statements true.

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