Q. 84.5( 6 Votes )

A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?
A. TT and Tt

B. Tt and Tt

C. TT and TT

D. Tt and tt

Answer :

Tt and Tt are the genotype of both the parents.


Tall plants can have the genotype as TT or Tt while dwarf plants can have the genotype as tt only.


In 1st case where the parents are having genotype as TT and Tt



All plant progeny are tall.


Therefore 1st case is not the answer as it does not generate any dwarf plants.


In 2nd case where the parents are having genotype as Tt and Tt



3/4th of the F2 plants are tall and 1/4th of the F2plants are dwarf.


Therefore 2nd case is the answer as 1/4th of the progeny are dwarf when two tall plants are crossed.


In 3rd case where the parents are having genotype as TT and TT



All the progeny are tall.


Therefore 3rdcase is not the answer as the cross does not generate any dwarf plants.


In the 4th casewhere plants are having genotype as Tt and tt ; one of them has the phenotype to be dwarf . But according to the question the cross is done between two tall plants , hence the given case is not the answer.

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