NEET · Biology · STD 12 - 4. principal of inheritance and variation

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

A Red flowered as well as pink flowered plants
B Only pink flowered plants
C Red, Pink as well as white flowered plants
D Only red flowered plants

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Answer & Solution

Correct Answer

(A) Red flowered as well as pink flowered plants

Step-by-step Solution

Detailed explanation

Pink colour flower in snapdragon have genotype \(R r\)

	\(R\)	\(R\)
\(R\)	\(RR\)	\(RR\)
\(r\)	\(Rr\)	\(Rr\)

Phenotype

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Match List \(I\) with List \(II\)

List \(I\)	List \(II\)
\(A\). Two or more alternative forms of a gene	\(I\). Backcross
\(B\). Cross of \(F_1\) progeny with homozygous recessive parents	\(II\). ploidy
\(C\). Cross of \(F_1\) progeny with any of the parents	\(III\). Allele
\(D\). Number of chromosome sets in plant	\(IV\). Test cross

Choose the correct answer from the options given below:

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