Question:
A cross between two plants resulted in the formation of tall and dwarf offsprings in the ratio of 3:1. The genotypes of their parents will be __________.
A cross between two plants resulted in the formation of tall and dwarf offsprings in the ratio of 3:1. The genotypes of their parents will be __________.
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A 3:1 phenotypic ratio is the classical monohybrid ratio and arises only when both parents are heterozygous.
Updated On: Nov 12, 2026
- TT and TT
- TT and tt
- Tt and Tt
- tt and tt
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
A 3:1 phenotypic ratio is the typical result of a monohybrid cross in which both parents are heterozygous.
Step 2: Cross the parents
Take \(\text{Tt}\times\text{Tt}\). Each parent forms gametes \(\text{T}\) and \(\text{t}\), so the offspring are \(\text{TT}:\text{Tt}:\text{Tt}:\text{tt}\).
Step 3: Read the ratio
\(\text{TT}\) and \(\text{Tt}\) are tall (3), and \(\text{tt}\) is dwarf (1). This gives 3 tall : 1 dwarf.
Step 4: Check the other options
\(\text{TT}\times\text{TT}\) and \(\text{TT}\times\text{tt}\) give only tall plants, and \(\text{tt}\times\text{tt}\) gives only dwarf plants.
Final Answer:
The parents have the genotypes Tt and Tt. \[ \boxed{\text{(C) }\text{Tt and Tt}} \]
A 3:1 phenotypic ratio is the typical result of a monohybrid cross in which both parents are heterozygous.
Step 2: Cross the parents
Take \(\text{Tt}\times\text{Tt}\). Each parent forms gametes \(\text{T}\) and \(\text{t}\), so the offspring are \(\text{TT}:\text{Tt}:\text{Tt}:\text{tt}\).
Step 3: Read the ratio
\(\text{TT}\) and \(\text{Tt}\) are tall (3), and \(\text{tt}\) is dwarf (1). This gives 3 tall : 1 dwarf.
Step 4: Check the other options
\(\text{TT}\times\text{TT}\) and \(\text{TT}\times\text{tt}\) give only tall plants, and \(\text{tt}\times\text{tt}\) gives only dwarf plants.
Final Answer:
The parents have the genotypes Tt and Tt. \[ \boxed{\text{(C) }\text{Tt and Tt}} \]
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