Question

Select the correctly paired one

• A. Monohybrid cross genotypic ratio - 3:1
• B. Monohybrid test cross phenotypic ratio: 1:1
• C. Dihybrid cross $F_2$ genotype - 1:2:1:2:2:2:1:2:1
• D. Monohybrid cross phenotypic ratio - 1:2:1

Answer 1

The correct option is B Monohybrid test cross phenotypic ratio: 1:1

The genotypic ratio of dihybrid cross is 1:2:1:2:4:2:1:2:1

The phenotypic ratio of monohybrid cross is 3:1 and its genotypic ratio is 1:2:1.

$F_1$ generation produced by monohybrid cross (TT x tt) --- Tt
Test cross: Tt x tt
Gametes: T t t
Offspring: Tt tt
Phenotypic ratio: 1 : 1