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Which of the following descriptions illustrates phenotype variation in an individual caused by the environment?

A) Variation in horse coat color
B) Average beak depth during drought
C) Inheritance of body builder "physique"
D) Diet of caterpillars changes their morphology

Answer :

The description that illustrates phenotype variation in an individual caused by the environment is B) average beak depth during drought.

This example refers to the phenomenon known as phenotypic plasticity, where an organism's phenotype is influenced by environmental factors. In the case of beak depth in birds, during a drought, the availability of food may decrease, leading to natural selection favoring individuals with deeper beaks that can efficiently extract food from available sources.

This environmental pressure can result in a shift in the average beak depth within a population over time. This demonstrates how the environment can influence the expression of a specific trait or phenotype in individuals.

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