In a monohybrid cross between two heterozygous pea plants (Tt), the phenotypic ratio of tall to dwarf in the offspring is expected to be: MCQ with Answer and Explanation
In a monohybrid cross between two heterozygous pea plants (Tt), the phenotypic ratio of tall to dwarf in the offspring is expected to be:
A. 1:1
B. 9:3:3:1
C. 3:1
D. 1:2:1
Answer: Option C
Solution (By JKExamLibrary)
When both parents are heterozygous (Tt × Tt), the offspring genotypes are TT (25%), Tt (50%), and tt (25%). Since tall (T) is dominant over dwarf (t), both TT and Tt are tall, resulting in 3 tall : 1 dwarf phenotypic ratio. The genotypic ratio is 1:2:1. 9:3:3:1 is the dihybrid phenotypic ratio. 1:1 ratio is seen in test cross (Tt × tt).
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