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? (1 point)
Responses

0%
0%

25%
25%

50%
50%

75%

Answer 1

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

The possible gametes from each parent are:
- The heterozygous tall plant (Tt) can produce gametes T and t.
- The homozygous recessive plant (tt) can only produce gametes t.

Setting up the Punnett square:

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

From the Punnett square, we see the following genotypes of the offspring:
- 2 Tt (tall)
- 2 tt (short)

Now we can calculate the percentage:
- Total offspring = 4
- Tall offspring (Tt) = 2

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

Therefore, 50% of the offspring are expected to be tall.

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