Identify the wrong statement

Options

A. Probability of homozygous dwarf progeny in a cross `T T xx Tt` is zero
B. Probability of homozygous tall progeny in a cross `T T xx T T` is one
C. Probability of homozygous tall progeny in a cross `T T x tt is 0.5
D. Probability of homozygous dwarf progeny in a cross `T T xx T T` is zero

Answer

To solve the question of identifying the wrong statement regarding genetic crosses, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement 1: Probability of homozygous dwarf progeny in a cross (TT x Tt) is 0.**
- **Analysis:**
- The cross involves a homozygous tall (TT) and a heterozygous tall (Tt).
- The gametes produced will be:
- From TT: T, T
- From Tt: T, t
- The possible offspring will be: TT, TT, Tt, Tt.
- There are no homozygous dwarf (tt) progeny produced.
- **Conclusion:** This statement is true.

2. **Statement 2: Probability of homozygous tall progeny in a cross (TT x TT) is 1.**
- **Analysis:**
- Both parents are homozygous tall (TT).
- The gametes produced will be:
- From TT: T, T
- From TT: T, T
- The only possible offspring will be TT.
- **Conclusion:** This statement is true.

3. **Statement 3: Probability of homozygous tall progeny in a cross (TT x tt) is 0.5.**
- **Analysis:**
- The cross involves a homozygous tall (TT) and a homozygous dwarf (tt).
- The gametes produced will be:
- From TT: T, T
- From tt: t, t
- The possible offspring will be:
- Tt, Tt (all heterozygous tall).
- There are no homozygous tall (TT) progeny produced.
- **Conclusion:** This statement is false; the probability of homozygous tall progeny is 0, not 0.5.

4. **Statement 4: Probability of homozygous tall progeny in a cross (Tt x Tt) is 0.**
- **Analysis:**
- The cross involves two heterozygous tall (Tt).
- The gametes produced will be:
- From Tt: T, t
- From Tt: T, t
- The possible offspring will be:
- TT, Tt, Tt, tt.
- There is a probability of 0.25 for TT (homozygous tall), not 0.
- **Conclusion:** This statement is also false.

### Final Conclusion:
The wrong statement among the provided options is **Statement 3**, which incorrectly states that the probability of homozygous tall progeny in the cross (TT x tt) is 0.5; it is actually 0.