Question

By which of the following means is the colour of skin determined in human beings?

• A. Quantitative
• B. Multiple gene
• C. Qualitative
• D. All of these

Hint:

Skin colour is determined by the complex interaction of multiple genes, which is influenced by both quantitative and qualitative traits.

Answer 1

The Correct Option is D

Step 1: Understand the factors affecting skin colour.
Skin colour in humans is influenced by multiple genetic factors and environmental influences. The genetic determination is primarily controlled by multiple genes, which exhibit both quantitative and qualitative traits.
Step 2: Analyze the options.
- Quantitative traits refer to those influenced by many genes with small effects. Skin colour is partly quantitative as it is influenced by several genes. - Multiple gene involvement means more than one gene contributes to the phenotype, which is true for skin colour. - Qualitative traits are those that exhibit distinct categories, but skin colour does not fit perfectly into distinct qualitative categories. However, it is also influenced by qualitative genetic variation.
Step 3: Conclusion.
Since skin colour involves both quantitative genetic contributions and multiple genes, the correct answer is ((D) All of these.
Final Answer: \[ \boxed{((D) \; All \; of \; these} \]