A cross between tall and dwarf Pea plants, yielded 124 tall and 126 dwarf plants. Genotype of parents would be

Options

A. TT X TT
B. TT x Tt`
C. `Tt xx Tt`
D. `Tt x tt

Answer

To determine the genotypes of the parent pea plants in the given cross, we can follow these steps:

### Step 1: Understand the Traits
Pea plants exhibit two traits in this question: tall (dominant) and dwarf (recessive). We denote the tall allele as "T" (dominant) and the dwarf allele as "t" (recessive).

### Step 2: Analyze the Offspring Ratio
The cross yielded 124 tall plants and 126 dwarf plants. This indicates that the number of dwarf plants is almost equal to the number of tall plants, suggesting a 1:1 ratio. This is characteristic of a monohybrid cross between a heterozygous and a homozygous recessive plant.

### Step 3: Determine Possible Genotypes
1. **TT (homozygous tall)**: Would produce only tall offspring (not possible here).
2. **Tt (heterozygous tall)**: Would produce a 1:1 ratio when crossed with tt (homozygous dwarf).
3. **tt (homozygous dwarf)**: Would produce only dwarf offspring when crossed with TT (not possible here).

### Step 4: Set Up the Cross
Based on the analysis:
- One parent must be heterozygous tall (Tt).
- The other parent must be homozygous dwarf (tt).

### Step 5: Conclusion
Thus, the genotypes of the parents are:
- Parent 1 (Tall): Tt
- Parent 2 (Dwarf): tt

### Final Answer
The genotypes of the parents are Tt (tall) and tt (dwarf).

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