Final answer:
The loss of the sucrase/isomaltase enzyme in Inuit populations is an example of gene loss or reduction.
Step-by-step explanation:
The loss of the sucrase/isomaltase enzyme in Inuit populations is an example of the evolutionary process known as gene loss or reduction. As Inuit populations traditionally relied on a diet low in carbohydrates, the sucrase/isomaltase enzyme, which helps break down sugars, became less important for survival and thus underwent a loss or reduction in activity. This is an example of natural selection favoring individuals who can extract nutrients more efficiently from available food sources.