Individuals that are heterozygous for sickle-cell anemia are more resistant to malaria than those that do not have a sickle-cell allele. Why does the sickle-cell allele not become fixed in the population?
A. Individuals homozygous for the sickle-cell
allele do not have the same resistance to
malaria.
B. Individuals that are homozygous without
the sickle-cell allele produce more offspring
than those with the sickle-cell allele.
C. Individuals that are homozygous for the
sickle-cell allele have sickle-cell anemia, and
are at a fitness disadvantage.
D. Individuals heterozygous for the sickle-cell
allele die earlier than either of the
homozygous individuals.
E. Analysis indicates the allele is becoming
fixed in the population.
C
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Which of the following best explains why the theory of evolution is taught in public schools?
a. The theory is considered the only viable scientific theory for the origin of life. b. The theory replaces the theory of natural selection. c. The theory addresses the idea of intelligent design. d. The theory explains the origin of the human species.
The lipids that cannot be synthesized by the liver are classified as ____
a. saturated fats b. unsaturated fates c. essential fatty acids d. cholesterol e. trans fatty acids
Segregation of alleles occurs
A: during gamete formation. B: at fertilization. C: during mitosis. D: during the random combination of gametes to produce the F2 generation. E: only in monohybrid crosses.
An isotope is an atom of an element that varies in mass number due to variation in the number of
A. atoms. B. protons. C. neutrons. D. electrons.