Number of gene pairs controlling human skin colour, human height and human intelligence are respectively

Options

A. 25, 3 and 5
B. 3,25 and 5
C. 5,25 and 3
D. 5,25 and 25

Answer

To solve the question regarding the number of gene pairs controlling human skin color, human height, and human intelligence, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Polygenic Inheritance**:
- Polygenic inheritance refers to the phenomenon where multiple genes (gene pairs) contribute to a single trait. This means that traits are not determined by a single gene but rather by the cumulative effects of several genes.

2. **Identifying Gene Pairs for Each Trait**:
- **Human Skin Color**: Research indicates that human skin color is controlled by approximately 5 gene pairs. These genes work together to produce the wide range of skin tones observed in humans.
- **Human Height**: Human height is a complex trait influenced by the cumulative effects of about 25 gene pairs. This large number of gene pairs reflects the variability in height among individuals.
- **Human Intelligence**: Similar to skin color, human intelligence is also influenced by around 5 gene pairs. The exact number can vary in studies, but it is generally accepted that multiple genes contribute to this trait.

3. **Summarizing the Findings**:
- Therefore, the number of gene pairs controlling:
- Human Skin Color: 5
- Human Height: 25
- Human Intelligence: 5

4. **Final Answer**:
- The respective numbers of gene pairs controlling human skin color, human height, and human intelligence are 5, 25, and 5.