In garden pea , starch synthesis is regulated by B and b alleles . Bb. genotype produces :

Options

A. Large sized round seeds.
B. Small sized wrinkled seeds.
C. Intermediate sized round seeds.
D. Large sized wrinkled seeds

Answer

To solve the question regarding the starch synthesis in garden pea regulated by the alleles B and b, we will follow these steps:

### Step 1: Understand the Alleles
- The alleles involved are B (dominant) and b (recessive).
- The genotype Bb represents a heterozygous condition where one allele is dominant (B) and the other is recessive (b).

**Hint:** Identify the roles of dominant and recessive alleles in the context of the trait being studied.

### Step 2: Analyze the Homozygous Conditions
- Homozygous BB (dominant) produces large starch grains.
- Homozygous bb (recessive) produces small starch grains.

**Hint:** Consider how the homozygous conditions contribute to the phenotype and what they imply about the heterozygous condition.

### Step 3: Cross the Homozygous Genotypes
- When BB is crossed with bb, the offspring will all be Bb (heterozygous).
- According to Mendel's law of dominance, we would expect the dominant trait to fully express, but in this case, it leads to an intermediate phenotype.

**Hint:** Use a Punnett square to visualize the genetic cross and the resulting genotypes.

### Step 4: Determine the Phenotype of the Heterozygous Condition
- The Bb genotype results in an intermediate phenotype, which is characterized by intermediate-sized round seeds.
- This phenomenon is an example of incomplete dominance, where neither allele is completely dominant over the other.

**Hint:** Reflect on the concept of incomplete dominance and how it differs from complete dominance.

### Step 5: Conclusion
- The Bb genotype produces intermediate-sized round seeds, which is the final answer to the question.

**Final Answer:** The Bb genotype produces intermediate-sized round seeds.