Question

Geneticists studying the gene for lactase did not find any differences in the coding region DNA between people who could digest lactose and people who could not digest lactose. After they investigated further, they discovered that the difference between lactose-tolerant and -intolerant individuals was due to a mutation located in Select one O a. the gene for glucose production O b. the genetic switch for the lactase gene C.a different gene that produces lactose If an individual is lactase persistent it means: Select one: a. she or he cannot properly digest milk b. she or he cannot properly digest milk as a baby c. she or he can digest milk as a baby d. she or he can digest milk as an adult o

Answer 1

The correct option is B : The genetic switch for lactase gene In most people, the gene for lactase, the enzyme that digests lactose, is activated at birth and deactivated after weaning.

However, the lactase gene is still active in the majority of Europeans. According to these findings, the lactase gene is often silenced by DNA methylation after early infancy.

However, SNPs that change the DNA sequence in the regulatory region prevent this methylation from occurring. Because the gene is maintained, this results in the production of lactase.

The correct option is C : She or he can digest milk as an adult Lactose intolerant people are unable to adequately digest the sugar (lactose) in milk.

As a result, individuals have diarrhea, gas, and bloating after consuming dairy products. The condition, also known as lactose malabsorption, is usually harmless, but its symptoms can be unpleasant.

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