Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

ZoologyPrinciples of Inheritance and VariationMendel's Laws of InheritanceEasy2 minPYQ_2026
ZoologyEasysingle choice

Given below are two statements : one is labelled asAssertion Aand the other is labelled asReason R.
Assertion A :In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf.
Reason R :Stem height is a contrasting trait, with tall being dominant and dwarf being recessive.
In the light of the above statements, choose themost appropriateanswer from the options given below :NEET 2026 (Re-NEET)

Options:

Answer:
B
Solution:

Assertion A is correct because when Mendel crossed true-breeding tall pea plants with true-breeding dwarf pea plants, all the plants in the F1 generation were tall.

Reason R is correct and explains Assertion A. Stem height is a contrasting trait in pea plants where the tall trait is dominant over the dwarf trait. Since the F1 progeny are heterozygous, the dominant allele expresses itself, resulting in all tall plants.

Therefore, both A and R are correct and R is the correct explanation of A.

Answer: Both and are correct and is the correct explanation of

Stream:NEETSubject:ZoologyTopic:Principles of Inheritance and VariationSubtopic:Mendel's Laws of Inheritance
⏱ 2mℹ️ Source: PYQ_2026

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