Dominant character is represented by a capital letter and recessive by small letter. Which of the following alleleic pairs are possible in F1 generation ?

AA , Aa

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TT, Tt

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Both A and B

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aa , tt

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Solution

The correct options are
A
AA , Aa

B
TT, Tt

Dominant alleles represented by capital letter expresses itself in both, homozygous condition (AA, TT ) or heterozygous condition ( Aa, Tt ) in F1 generation. Recessive traits express only in the F2 generation ( in case of Monohybrid / Dihybrid cross ) i.e when they are in homozygous condition (aa, tt).

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Similar questions

Q. A cross between a tall plant (TT) and short plant (tt) resulted in progeny that were all tall plants because :
(a) tallness is the dominant trait
(b) shortness is the dominant trait
(c) tallness is the recessive trait
(d) height of plant is not governed by gene T or t

Dominant character is represented by a capital letter and recessive by small letter. Which of the following alleleic pairs are possible in F1 generation ?

Q. A student makes a monohybrid cross between TT and tt plants, where T is dominant and t is recessive. Identify the correct statements on the basis of the information given.

Statement 1: Recessive traits are expressed in both

F_{1}

and

F_{2}

generation.

Statement 2: Recessive traits are expressed only in the absence of corresponding dominant trait in the offspring.

Q. Predict the genotype and phenotype of the following crossed in pea.
(i) TT × Tt
(ii) tt × TT
(iii) TTrr × ttRR
(iv) TtRr × TtRr

(Capital letters shows dominance)
(i) Give the ratio of phenotypes of these crosses.
(ii) Mention whether the cross is a monohybrid of dihybrid.

Q. Why are two letters (such as TT,Tt,tt) used to denote the character of height?

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