Why do different bat stars (Patiria miniata) have colors that range from orange to mottled purple?

• A. Color differences are caused by the type of food each bat star eats.
• B. Bat stars acquire their color from symbiotic algae living in their tissues.
• C. Genetic variation within the population leads to differences in coloration.
• D. All bat stars change color based on the temperature of the water.

Answer: (C)

Verified step by step guidance

1. Understand the concept of genetic variation: Genetic variation refers to the differences in DNA sequences among individuals within a population. These differences can lead to variations in traits, such as coloration, due to the expression of different genes.
2. Recognize that coloration in organisms, including bat stars, is often influenced by genetic factors. Genes control the production of pigments or other structural features that determine color.
3. Eliminate alternative explanations: While environmental factors like food or symbiotic relationships can influence coloration in some species, the problem specifies that genetic variation is the correct explanation for bat star coloration. This means the color differences are inherited rather than acquired from external factors.
4. Consider the role of population diversity: In a population of bat stars, genetic diversity ensures that individuals may inherit different combinations of alleles (gene variants), leading to a range of colors such as orange or mottled purple.
5. Conclude that genetic variation within the population is the primary driver of coloration differences in bat stars, as stated in the correct answer provided in the problem.