Familial hypercholesterolemia is a disease that is incompletely dominant. This means that
A. the dominant allele completely masks the recessive allele, so the dominant phenotype is displayed. In the case of familial hypercholesterolemia, heterozygotes will have extremely high levels of cholesterol, identical to those seen in homozygous dominant individuals.
B. the dominant allele does not fully mask the recessive allele, so an intermediate phenotype is displayed. In the case of familial hypercholesterolemia, heterozygotes have moderately higher levels of cholesterol compared to normal.
C. the dominant allele is equally dominant with a second (or third) dominant allele, so both phenotypes are displayed. In the case of familial hypercholesterolemia, heterozygotes have moderately higher levels of cholesterol compared to normal.
D. multiple alleles exist for this trait, so multiple phenotypes are possible. In the case of familial hypercholesterolemia, heterozygotes can have a range of cholesterol levels depending on which combination of alleles exists.
Answer: B
You might also like to view...
How are anoxygenic phototrophic microorganisms more physiologically diverse than oxygenic phototrophic microorganisms? Be specific in your answers and use examples to illustrate your conclusions
What will be an ideal response?
During incubation and convalescence a person may still spread infectious organisms
Indicate whether this statement is true or false.
In 2011, the largest dollar volume of imports for the U.S. came from
a. consumer goods. b. industrial supplies. c. petroleum. d. automobiles.
Which of the following was not an energy source on early Earth?
A. meteorites B. ultraviolet radiation C. lightning D. ozone layer E. volcanoes