Go through the following statements in respect of pea.
I. A single gene product may produce more than one effect.
II. BB produces round seed with large sized starch grain.
III. bb produces wrinkled seed with small sized grain.
IV. Bb produces round seeds with larged grain
V. Heterozygote Bb produces round seed with intermediate sized starch grain.
VI. Allele B is dominant over allele b in respect of seed shape but their relation is incomplete dominance in respect of starch grain size.
How many of the above statements are correct?

Options

A. One
B. All
C. Five
D. Four

Answer

To determine how many of the statements regarding pea plants are correct, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement I: A single gene product may produce more than one effect.**
- This statement is true. This phenomenon is known as pleiotropy, where one gene can influence multiple traits.

2. **Statement II: BB produces round seed with large sized starch grain.**
- This statement is true. In pea plants, the dominant allele (B) results in round seeds and is associated with larger starch grain size.

3. **Statement III: bb produces wrinkled seed with small sized grain.**
- This statement is true. The homozygous recessive genotype (bb) results in wrinkled seeds and smaller starch grains.

4. **Statement IV: Bb produces round seeds with large grain.**
- This statement is true. The heterozygous genotype (Bb) expresses the dominant trait, resulting in round seeds and larger grains.

5. **Statement V: Heterozygote Bb produces round seed with intermediate sized starch grain.**
- This statement is false. The heterozygote (Bb) produces round seeds with large starch grains, not intermediate size.

6. **Statement VI: Allele B is dominant over allele b in respect of seed shape but their relation is incomplete dominance in respect of starch grain size.**
- This statement is true. While B is dominant over b for seed shape (round vs. wrinkled), the relationship regarding starch grain size can exhibit incomplete dominance, leading to variations in grain size.

### Summary of Correct Statements:
- Statements I, II, III, IV, and VI are correct.
- Statement V is incorrect.

### Total Correct Statements:
- There are **5 correct statements** out of the 6 provided.