Question

in plea 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 25%
b 50%
c 75%
d 0%

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.

1. The genotypes of the parents are:
- Heterozygous tall (Tt)
- Homozygous recessive short (tt)

2. Set up the Punnett square:

| | T | t |
|-------|-------|-------|
| **t** | Tt | tt |
| **t** | Tt | tt |

3. The possible genotypes of the offspring are:
- Tt (tall)
- tt (short)

4. From the Punnett square:
- 2 out of 4 offspring will be Tt (tall)
- 2 out of 4 offspring will be tt (short)

5. This means that 50% of the offspring are expected to be tall plants.

Therefore, the answer is **b 50%**.