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.
Rate this question :






















It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the
Biology - ExemplarMother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group, respectively. What would be the genotype of both mother and father?
Biology - ExemplarHow are alleles of particular gene differ from each other? Explain its significance.
Biology - ExemplarPerson having genotype IA IB would show the blood group as AB. This is because of:
Biology - ExemplarWhat is the cross between the progeny of F1 and the homozygous recessive parent called? How is it useful?
Biology - ExemplarA plant with red flowers was crossed with another plant with yellow flowers. If F1 showed all flowers orange in colour, explain the inheritance.
Biology - ExemplarDiscuss the genetic basis of wrinkled phenotype of pea seed.
Biology - Exemplar