Two pea plants were subjected cross pollination. Of the 183 plants produced in the next generation, 94 plants were found to be all and 89 plants were found to be dwarf. The genotypes of the two parental plants are likely to be:

Options

A. TT and tt
B. Tt and Tt
C. Tt and tt
D. TT and TT

Answer

To determine the genotypes of the two parental pea plants based on the offspring produced, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Phenotypes and Their Counts**:
- From the problem, we know that there are 183 offspring in total.
- Out of these, 94 are tall and 89 are dwarf.

2. **Determine the Ratio of Offspring**:
- The ratio of tall to dwarf plants is 94:89. This is approximately 1:1, which suggests that the traits are segregating in a simple Mendelian manner.

3. **Understand the Genetic Basis**:
- In pea plants, the tall trait (T) is dominant over the dwarf trait (t).
- Therefore, the possible genotypes for tall plants are either homozygous tall (TT) or heterozygous tall (Tt), while dwarf plants must be homozygous dwarf (tt).

4. **Analyze Possible Parental Genotypes**:
- We need to find a combination of parental genotypes that could produce a 1:1 ratio of tall to dwarf offspring.
- The possible combinations are:
- TT x tt → All offspring would be Tt (tall).
- Tt x Tt → Offspring would be 1 TT (tall): 2 Tt (tall): 1 tt (dwarf), which is a 3:1 ratio.
- Tt x tt → Offspring would be 1 Tt (tall): 1 tt (dwarf), which is a 1:1 ratio.

5. **Select the Correct Parental Genotypes**:
- Given the observed 1:1 ratio of tall to dwarf plants, the most likely parental genotypes are:
- One parent is heterozygous tall (Tt) and the other parent is homozygous dwarf (tt).

6. **Conclusion**:
- Therefore, the genotypes of the two parental plants are likely to be Tt (heterozygous tall) and tt (homozygous dwarf).

### Final Answer:
The genotypes of the two parental plants are Tt (heterozygous tall) and tt (homozygous dwarf).

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