A gene that controls the ability to metabolize lactose is common in people in some parts of the world and rare in other parts of the world. That gene is largely responsible for variations in the probability that a person will

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The gene that controls the ability to metabolize lactose is known as lactase. It is common in populations with a history of dairy farming, such as Europeans, and allows for the digestion of lactose, the sugar in milk. In contrast, it is rare in populations without a history of dairy farming, such as some Asian, African, and Native American populations. This means that individuals with the lactase gene are more likely to enjoy dairy products as adults, while those without the gene may experience lactose intolerance. The other options are not related to lactase or the ability to metabolize lactose.

A Gene That Controls the Ability to Metabolize Lactose Is