Question

V) In pea plants, tall plants (T) are dominant over short plants (t). If a heterozygous tall pea
plant is crossed with a homozygous recessive short pea plant, what percentage of the offspring
is expected to be tall? (HINT: set up a Punnett Square). (1 point)
0%
25%
50%
75%

Answer 1

To determine the percentage of tall offspring when a heterozygous tall pea plant (Tt) is crossed with a homozygous recessive short pea plant (tt), we can use a Punnett Square.

1. **Set up the Punnett Square**:

- The alleles from the heterozygous tall plant (Tt) will be T and t.
- The alleles from the homozygous recessive short plant (tt) will be t and t.

The Punnett Square looks like this:

```
T | t
-----------------
t | Tt | tt
-----------------
t | Tt | tt
```

2. **Results of the Punnett Square**:
- The possible genotypes of the offspring are:
- Tt (tall) - 2 squares
- tt (short) - 2 squares

3. **Calculate the percentage**:
- There are a total of 4 squares.
- The tall plants (Tt) appear in 2 of the squares.

Percentage of tall offspring = (Number of tall offspring / Total offspring) × 100
= (2 / 4) × 100 = 50%

Thus, the expected percentage of the offspring that is tall is **50%**.