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.

---

Definitions:

Sex Role Reversal

A situation in which the traditional reproductive roles of males and females are exchanged.

Ornaments

Decorative features or structures, often relating to animals, that enhance their appearance, possibly playing a role in mating and sexual selection.

Armaments

Physical or biological weapons used by organisms, such as horns or venom, to defend themselves, fight, or deter predators.

Male Paternity

Relates to the genetic fatherhood in species, often investigated in the context of paternity assurance and reproductive strategies.