Question

CROSS A HETEROZYGOUS TALL PLANT WITH A HOMOZYGOUS TALL PLANT. WHAT PERCENTAGE WILL BE SHORT?
• Step 1- Identify the Trait - Plant Height
• Step 2- Identify the Alleles and Genotypes
T-tall t- short = Tall ____= short
• Step 3- Identify the parent genotypes
Heterozygous tall Homozygous tall_
• Step 4 Punnet Square
• Step 5 Answer the question
% short plant

Answer 1

To solve the problem of crossing a heterozygous tall plant with a homozygous tall plant, we can follow the steps you've outlined:

### Step 1: Identify the Trait
- **Trait**: Plant Height

### Step 2: Identify the Alleles and Genotypes
- **Alleles**: T (tall) and t (short)
- **Genotypes**:
- Tall (T): Can be either homozygous (TT) or heterozygous (Tt)
- Short (t): Homozygous (tt)

### Step 3: Identify the Parent Genotypes
- **Heterozygous tall plant**: Tt
- **Homozygous tall plant**: TT

### Step 4: Punnett Square

We will set up a Punnett square to visualize the genetic cross between Tt (heterozygous) and TT (homozygous tall).

```
T T
__________
T | TT | TT |
|________|________|
t | Tt | Tt |
|________|________|
```

### Step 5: Analyze the Punnett Square

The resulting genotypes from the Punnett square are:
- 2 TT (tall)
- 2 Tt (tall)

### Step 6: Answer the Question

Now, we calculate the percentages of each genotype:

- Total offspring = 4 (2 TT + 2 Tt)
- Tall plants = 4 (100%)
- Short plants = 0 (0%)

### Conclusion

The percentage of short plants from this cross is **0%**. All the offspring will be tall (either homozygous TT or heterozygous Tt).