Which one of the following pairs of features is a good example of polygenic inheritance?

Options

A. Human height and skin colour
B. ABO blood groups in humans and flower colour of Mirabilis jalapa
C. Hair pigment of mouse and tongue rolling in humans
D. Human eye colour and sickle cell anaemia

Answer

To determine which pair of features is a good example of polygenic inheritance, we need to understand what polygenic inheritance is and analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Polygenic Inheritance**:
- Polygenic inheritance refers to a trait that is controlled by two or more genes. This means that multiple genes contribute to the phenotype of a trait.

2. **Analyzing the Options**:
- **Option 1: Human height and skin color**:
- Both human height and skin color are traits that are influenced by multiple genes. For instance, skin color is determined by several genes that control the production of melanin, and height is influenced by various genetic factors.
- **Conclusion**: This is a good example of polygenic inheritance.

- **Option 2: ABO blood groups in humans and flower color of Mirabilis Jalapa**:
- ABO blood groups are determined by multiple alleles (A, B, O) but not by multiple genes, making it an example of multiple alleles rather than polygenic inheritance. Flower color in Mirabilis Jalapa is an example of incomplete dominance, not polygenic inheritance.
- **Conclusion**: This is not a good example of polygenic inheritance.

- **Option 3: Hair pigment of mouse and tongue rolling in humans**:
- Hair pigment in mice can be influenced by multiple genes (polygenic), but tongue rolling in humans is a trait that is typically controlled by a single gene.
- **Conclusion**: This is not a good example of polygenic inheritance.

- **Option 4: Human eye color and sickle cell anemia**:
- Human eye color is a polygenic trait, but sickle cell anemia is caused by a single gene mutation and is an example of co-dominance.
- **Conclusion**: This is not a good example of polygenic inheritance.

3. **Final Answer**:
- The best example of polygenic inheritance from the options given is **Option 1: Human height and skin color**.