In a complimentary gene interaction calculate the number of phenotype and genotype .

Options

A. 1 phenotype, 2 genotyupes
B. 2 phenotypes, 4 genotypes
C. 4 phenotypes, 4 genotypes
D. 2 phenotypes, 2 genotypes

Answer

To solve the problem regarding the number of phenotypes and genotypes in a complementary gene interaction, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Complementary Gene Interaction**:
- In complementary gene interaction, two different genes interact to produce a specific phenotype. For a trait to be expressed, both dominant alleles from the interacting genes must be present.

2. **Identify the Genes and Their Alleles**:
- Let's consider two genes:
- Gene C (with alleles C - dominant, c - recessive)
- Gene P (with alleles P - dominant, p - recessive)

3. **Determine the Phenotypes**:
- In the case of complementary genes, the presence of at least one dominant allele from both genes (C and P) is required for the expression of the dominant phenotype (purple flowers).
- If either or both alleles are recessive (cc or pp), the phenotype will be white flowers.
- Therefore, we can conclude that there are **2 phenotypes**:
- Purple (when at least one dominant allele from both genes is present)
- White (when at least one recessive allele is present in either gene)

4. **Determine the Genotypes**:
- The possible combinations of alleles can be derived from a dihybrid cross (C/c x P/p):
- CC PP (Purple)
- CC Pp (Purple)
- CC pp (White)
- Cc PP (Purple)
- Cc Pp (Purple)
- Cc pp (White)
- cc PP (White)
- cc Pp (White)
- cc pp (White)

- From these combinations, we can see that the genotypes that lead to purple flowers are:
- CC PP
- CC Pp
- Cc PP
- Cc Pp
- The genotypes that lead to white flowers are:
- CC pp
- Cc pp
- cc PP
- cc Pp
- cc pp

5. **Count the Unique Genotypes**:
- The unique genotypes leading to purple flowers are 4, and the unique genotypes leading to white flowers are 7.
- Thus, the total number of unique genotypes is **4**.

6. **Final Conclusion**:
- Therefore, in a complementary gene interaction, we have:
- **Number of Phenotypes**: 2 (Purple and White)
- **Number of Genotypes**: 4

### Summary:
- **Phenotypes**: 2 (Purple, White)
- **Genotypes**: 4