Question

The dominant allele for smooth pod shape in peas is S. The recessive allele for constricted pod shape is s.
In the Punnett square, show the result of crossing two heterozygous parents (Ss).
Write the genotype and the phenotype of each type of offspring in the space provided.

SS:
Genotype:
Phenotype:

Ss:
Genotype:
Phenotype:

ss:
Genotype:
Phenotype:

Answer 1

To determine the genotype and phenotype of the offspring when crossing two heterozygous parents (Ss), we can set up a Punnett square.

### Punnett Square for Ss x Ss:

```
S s
-----------------
S | SS | Ss |
-----------------
s | Ss | ss |
-----------------
```

### Offspring Results:

1. **SS:**
- **Genotype:** Homozygous dominant (SS)
- **Phenotype:** Smooth pod shape

2. **Ss:**
- **Genotype:** Heterozygous (Ss)
- **Phenotype:** Smooth pod shape

3. **ss:**
- **Genotype:** Homozygous recessive (ss)
- **Phenotype:** Constricted pod shape

### Summary of Ratios:
- **Genotype Ratios:** 1 SS : 2 Ss : 1 ss
- **Phenotype Ratios:** 3 Smooth : 1 Constricted

In conclusion, when crossing two heterozygous parents (Ss), the possible genotypes of the offspring are SS, Ss, and ss, with the corresponding phenotypes being smooth and constricted pod shapes.