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: use a Punnett square to help you with this question)(1 point)Responses50%50%0%0%25%25%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.

Here are the genotypes of the parent plants:
- Heterozygous tall plant (Tt)
- Homozygous recessive short plant (tt)

Now, we set up the Punnett square:

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

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

This means:
- 2 out of 4 offspring will be tall (Tt)
- 2 out of 4 offspring will be short (tt)

To find the percentage of tall plants, we calculate:
- \( \frac{2 \text{ (tall offspring)}}{4 \text{ (total offspring)}} \times 100 = 50\% \)

So, the percentage of the offspring expected to be tall is **50%**.