Question

farmer decides to cross a heterozygous tall pea plant (Tt) with a homozygous tall pea plant (TT). What percent of the offspring will be tall?


25%


50%


75%


100%

Answer 1

To determine the percentage of tall offspring from crossing a heterozygous tall pea plant (Tt) with a homozygous tall pea plant (TT), we can use a Punnett square.

1. **Parental Genotypes**:
- Parent 1 (Tt): Tall (heterozygous)
- Parent 2 (TT): Tall (homozygous)

2. **Possible Alleles**:
- Parent 1 can contribute either T or t.
- Parent 2 can only contribute T.

3. **Punnett Square**:

\[
\begin{array}{c|c|c}
& T & T \\
\hline
T & TT & TT \\
\hline
t & Tt & Tt \\
\end{array}
\]

4. **Offspring Genotypes**:
- TT (2 out of 4) - Homozygous tall
- Tt (2 out of 4) - Heterozygous tall

5. **Phenotypes**:
- All offspring (4 out of 4) will be tall (either TT or Tt).

So, 100% of the offspring will be tall.

The answer is **100%**.