Home › UP Board Class 12 › biology › Principles of Inheritance and Variation › The genotypic ratio in the F₂ of a monohybrid cr…
The genotypic ratio in the F₂ of a monohybrid cross between Tt × Tt is
A3 : 1
B1 : 1
C9 : 3 : 3 : 1
D1 : 2 : 1
Answer & Solution
Correct answer: D. 1 : 2 : 1
Tt × Tt gives 1 TT : 2 Tt : 1 tt — a 1:2:1 genotypic ratio. The 3:1 figure is the **phenotype** ratio because TT and Tt both look tall.
Related questions
Haemophilia and colour blindness are MORE COMMON in MALES than females because they are:Down syndrome is most commonly caused by:Sickle cell anaemia is caused by:The sex of a human baby is determined by:In the human ABO blood group system, a person with blood group AB has the genotype:In snapdragon (Antirrhinum), RR (red) × rr (white) gives F1 plants that are PINK. This patIn a DIHYBRID cross of YyRr × YyRr, the F2 phenotypic ratio is:In a monohybrid cross of Tt × Tt, the F2 PHENOTYPIC ratio is: