Explain why lactose intolerance is considered a variation in gene expression rather than a genetic disorder
What will be an ideal response?
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.
You might also like to view...
Each DNA strand serves as a _____during DNA synthesis
a. replicate b. substitute c. template d. source of nucleotides e. primer
Blue poppies native to China are grown at a plant-breeding center in California. Those with the thickest leaves survive and reproduce best in California's drier climate. This evolutionary adaptation of the poppies to their new environment is due to __________.
A. genetic drift B. stabilizing selection C. directional selection D. neutral variation
The part of a chlorophyll molecule that absorbs light energy is the porphyrin ring
__________________ Indicate whether the statement is true or false.
In a chemical reaction, 1,3-bisphosphoglycerate + ADP yields 3-phosphoglycerate plus ATP. What is the delta G for this reaction?
A. equal to zero B. less than zero C. greater than zero D. cannot be determined