The study of sickle-cell anemia and its relation to malarial environments demonstrates that
A. heterozygotes are not as selectively fit as are dominant homozygotes.
B. a maladaptive allele may be preserved if it provides an advantage.
C. homozygotes lack the capacity to digest lactose.
D. natural selection improves a gene pool by wiping out deleterious alleles.
E. selection removes recessive alleles from the gene pool faster than it does dominant alleles.
Answer: B
You might also like to view...
The human brain reaches 50 percent of its adult size by what age?
a. ?1 month
b. ?5 years
c. ?21 years
d. 6 months
e. ?3 years
What is the term used for a method of removing flakes from a core by pressing a pointed implement against stone?
a. Microliths b. Direct percussion c. Microwear d. Phytoliths e. Pressure flaking
Since Japan is a homogeneous society, there is less need for litigation than in the United States
Indicate whether the statement is true or false.
Although Darwin went aboard the HMS Beagle believing in the fixity of species, what impact changed his beliefs?
a. The people with whom he traveled b. The discovery of fossils of ancient giant animals similar to contemporary species c. The distance from church and society d. The death of his child e. The discovery of savages which looked more like apes