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? (HINT: set up a Punnett Square).(1 point) Responses 0% 0% 25% 25% 50% 50% 75%

Answer 1

To determine the percentage of tall offspring from the cross of a heterozygous tall pea plant (Tt) with a homozygous recessive short pea plant (tt), we can set up a Punnett Square.

1. The alleles of the heterozygous tall plant (Tt) are T and t.
2. The alleles of the homozygous recessive short plant (tt) are t and t.

The Punnett Square will look like this:

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

From this Punnett Square, we can see the possible genotypes of the offspring:
- Tt (tall) — 2 squares
- tt (short) — 2 squares

So, out of 4 total offspring:
- 2 will be tall (Tt)
- 2 will be short (tt)

To calculate the percentage of tall offspring:
- Number of tall offspring = 2
- Total number of offspring = 4

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

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