A man who is a silent carrier of the FMO3 "fish odor syndrome" has children by a woman who is "normal." Which of the following would best explain how a child born from these parents could have fish odor syndrome?

a) The child inherits two copies of defective FMO3 alleles from its father.
b) The mother is also a silent carrier of the defective FMO3 allele.
c) FMO3 is x-linked.
d) The child has a mutation in one of its cells, making the FMO3 genes defective in those cells.
e) The child inherits two copies of defective FMO3 alleles from its mother.


Ans: b) The mother is also a silent carrier of the defective FMO3 allele.

Biology & Microbiology

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