Lactose Intolerance Results When a Person Inherits Two Defective Alleles

question 128

Multiple Choice

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?

• A) The person would not digest lactose at all.
• B) The person would digest less lactose than normal.
• C) The person would make lactase but not use it.
• D) The person would make more lactase than normal.
• E) The person would make no lactase but could digest lactose.

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