Which of the following are examples of environmental effects on phenotype?

• A. Sunlight causing skin to tan
• B. A genetic mutation causing albinism
• C. Inherited blood type
• D. Height determined solely by genetics

Answer: (A)

Verified step by step guidance

1. Understand the concept of phenotype: Phenotype refers to the observable characteristics or traits of an organism, such as its morphology, development, biochemical or physiological properties, and behavior.
2. Identify environmental effects on phenotype: Environmental effects on phenotype occur when external factors influence the expression of traits. These factors can include sunlight, temperature, nutrition, and more.
3. Analyze the given examples: Consider each example and determine if it involves an environmental factor affecting the phenotype.
4. Example 1: Sunlight causing skin to tan - This is an environmental effect because sunlight (an external factor) influences the skin's pigmentation.
5. Example 2: A genetic mutation causing albinism - This is not an environmental effect; it is a genetic effect because it is caused by a mutation in the genes. Similarly, inherited blood type and height determined solely by genetics are not influenced by environmental factors.