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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?(a) VV(b) Vv(c) vv(d) vI 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

Answer»

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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