In a cross 45 tall and 14 dwarf plants were obtained. Genotypes of parents are:

Options

A. T T x T T
B. T T x T t
C. `TtxxTt`
D. T T x t t

Answer

To solve the question regarding the genotypes of the parent plants based on the given offspring ratios, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Given Data**:
- We have a total of 59 plants (45 tall + 14 dwarf).
- The ratio of tall to dwarf plants is approximately 3:1.

2. **Identifying the Phenotypes**:
- Tall plants are dominant (T) and dwarf plants are recessive (t).
- The phenotypic ratio of 3:1 suggests that the tall plants could be either homozygous dominant (TT) or heterozygous (Tt).

3. **Determining Possible Genotypes of Parents**:
- If both parents were homozygous tall (TT), all offspring would be tall (no dwarf plants).
- If one parent is homozygous tall (TT) and the other is dwarf (tt), all offspring would be tall (Tt).
- If both parents are heterozygous (Tt), the offspring would yield a 3:1 ratio (3 tall: 1 dwarf).

4. **Analyzing the Options**:
- The first two options would not produce any dwarf plants, making them incorrect.
- The third option, where both parents are heterozygous (Tt), would produce the expected 3:1 ratio of tall to dwarf plants.
- The last option also suggests only tall plants, which is incorrect.

5. **Conclusion**:
- The correct genotypes of the parents are likely both heterozygous (Tt).

### Final Answer:
The genotypes of the parents are both heterozygous (Tt).

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