Which one is incorrect?
(a) Polygenic character is controlled by multiple genes
(b) Numerous intermediate types and found in between the two extremes in polygenic inheritance
(c) Height, weight and skin color are polygenic
(d) Polygenic trait is controlled by multiple alleles

Options

A. Polygenic character is controlled by multiple genes
B. Numerous intermediate types and found in between the two extremes in polygenic inheritance
C. Height, weight and skin colour are polygenic
D. Polygenic trait is controlled by multiple alleles.

Answer

To determine which statement is incorrect among the options provided, we will analyze each statement one by one.

**Step 1: Analyze Option (a)**
Statement: "Polygenic character is controlled by multiple genes."
- This statement is true. Polygenic traits are indeed controlled by multiple genes, each contributing to the overall phenotype.

**Step 2: Analyze Option (b)**
Statement: "Numerous intermediate types are found in between the two extremes in polygenic inheritance."
- This statement is also true. In polygenic inheritance, traits often show a continuous range of phenotypes, resulting in various intermediate forms between the extremes.

**Step 3: Analyze Option (c)**
Statement: "Height, weight, and skin color are polygenic."
- This statement is true as well. All these traits are influenced by multiple genes, making them polygenic traits.

**Step 4: Analyze Option (d)**
Statement: "Polygenic trait is controlled by multiple alleles."
- This statement is incorrect. Polygenic traits are controlled by multiple genes, not by multiple alleles of a single gene. Multiple alleles refer to different forms of a single gene, while polygenic inheritance involves several different genes contributing to a single trait.

**Conclusion:**
The incorrect statement is (d) "Polygenic trait is controlled by multiple alleles."

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