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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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cnv02 cnv02
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6 years ago
Explain why lactose intolerance is considered a variation in gene expression rather than a genetic disorder.
 
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#1
6 years ago
Lactose intolerance is not considered a genetic disorder, but rather a variation in gene expression because there is no faulty gene or metabolic pathway breakdown involved. Lactose intolerance is due to wide phenotypic differences in the ability to digest lactose resulting from various normal' allelic combinations. These allelic combinations do not contain any faulty' genes that disrupt normal metabolism, but rather express themselves normally,' making some people lactose intolerant and others not.
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