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What is the genotype of a plant showing a dominant phenotype of violet flowers if it is test crossed and produces only violet-flowered plants?

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in Biology – Class 12 by (271k points)
What is the genotype of a plant showing a dominant phenotype of violet flowers if it is test crossed and produces only violet-flowered plants?

(a) VV

(b) Vv

(c) vv

(d) v

I had been asked this question during a job interview.

My question is based upon Inheritance Principles in chapter Principles of Inheritance and Variation of Biology – Class 12

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The correct choice is (a) VV

Easiest explanation: Test cross involves a cross between the plant whose genotype is to be determined with the homozygous recessive plants. If a violet-flowered plant is crossed with white-flowered plant, the offsprings will have one v allele. Thus, to exhibit a phenotype of violet-flowering, the genotype will be Vv. Hence the parent will have a genotype of VV.

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