Question

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?

A: 0%

B: 25%

C: 50%

D: 75%

Answer 1

To determine the expected percentage of tall offspring from the cross between a heterozygous tall pea plant (Tt) and a homozygous recessive short pea plant (tt), we can use a Punnett square.

Here's how the Punnett square would look:

```
T t
______________
t | Tt | tt |
______________
t | Tt | tt |
______________
```

From the Punnett square, we see there are two possible genotypes for the offspring:

- Tt (tall) - 2 squares
- tt (short) - 2 squares

Thus, the expected genotypic ratio is:
- 50% Tt (tall)
- 50% tt (short)

Therefore, the percentage of offspring that is expected to be tall (Tt) is 50%.

The answer is **C: 50%**.