Lactose intolerance results when a person inherits two defective alleles for the lactase gene.Normally,this gene produces the enzyme lactase,which breaks down lactose during digestion.What would most likely happen if a person had one defective allele and the other allele was functional?

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If a person has one defective allele and the other allele is functional, they will still be able to produce some lactase enzyme. However, their ability to digest lactose may be reduced, resulting in a lower tolerance for lactose-containing foods.

Lactose Intolerance Results When a Person Inherits Two Defective Alleles