In our human ancestors, the enzyme lactase, which allows us to digest the milk sugar lactose, was produced only during infancy. today, many adults can digest lactose, while others cannot. which group was born with a point mutation in the regulatory dna of their lactase genes?

The group with mutation is the people who can digest lactose.

Explanation:

As said in the question, human ancestors only produced lactose during the first years of life in order to digest breastmilk. Therefore, the production of it during adulthood certainly exposes a mutation in the regulatory DNA of the lactase production genes.

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ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'