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Which of the following statements is / a...

Which of the following statements is / are correct for a polygenic inheritance ?
1. They show uniformity.
2. Controlled by three or more genes.
3. It is not influenced by the environment .
In polygenic inheritance, phenotype reflects the contribution of recessive allele only .

A

1 and 2

B

2 , 3 and 4

C

1, 3 and 4

D

only 2

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding polygenic inheritance, we need to analyze each statement provided and determine their correctness based on the principles of polygenic inheritance. ### Step-by-Step Solution: 1. **Statement 1: They show uniformity.** - Polygenic traits do not show uniformity. Instead, they exhibit a range of phenotypes due to the influence of multiple genes. Therefore, this statement is **incorrect**. 2. **Statement 2: Controlled by three or more genes.** - Polygenic inheritance involves multiple genes (often three or more) that contribute to a single trait. This statement is **correct**. 3. **Statement 3: It is not influenced by the environment.** - Polygenic traits can be influenced by environmental factors, which can affect the expression of the genes involved. Therefore, this statement is **incorrect**. 4. **Statement 4: In polygenic inheritance, phenotype reflects the contribution of recessive allele only.** - In polygenic inheritance, the phenotype is influenced by both dominant and recessive alleles from multiple genes, not just the recessive alleles. Thus, this statement is **incorrect**. ### Conclusion: - The only correct statement is **Statement 2**: Controlled by three or more genes. - Therefore, the correct answer is **only Statement 2**.
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