Sickle cell anemia (a serious heritable disease) appears to be maintained via balancing selection in some Af-rican populations, because heterozygous carriers for the fully recessive disease allele are less affected by ma-laria parasites
Is this a case of antagonistic pleiotropy?
a. Yes, the same allele has positive effects on one trait and negative effects on another trait.
b. Yes, wild-type and sickle cell alleles have antagonistic effects.
c. No, there is no time lag between the two traits (i.e., as in early vs. late acting).
d. No, it involves a dominance interaction between the wild-type and the sickle cell allele.
B
You might also like to view...
Which of the following lists the stages of embryonic development in the correct order
following fertilization?
a. zygote, morula, blastula, gastrula, embryo b. morula, blastula, gastrula, zygote, embryo c. gastrula, blastula, morula, embryo, zygote d. embryo, blastula, gastrula, morula, zygote
The severe diarrhea associated with cholera is brought about by
a. an associated virus. b. an enterotoxin. c. an exotoxin. d. a buildup of electrolytes. e. retention of water.
Your research project involves characterizing the expression pattern of a nuclear pore protein. After using immunohistochemistry to fluorescently label the protein, you decide that you would like to capture the data as a 3-D image. Which microscope should you use?
A. phase-contrast microscope B. confocal microscope C. scanning electron microscope D. fluorescence microscope
Mechanical digestion begins in the _______.
A) mouth B) large intestine C) stomach D) small intestine