What accounts for the fact that polydactylism is prevalent and Tay-Sachs disease virtually absent in
one human population in the United States, while Tay-Sachs disease is prevalent and polydactylism
virtually absent in another?
a. Natural selection has promoted these differences since humans live in many different
environments.
b. Mutation rates differ between different loci.
c. There is little gene flow between the two populations.
d. The populations are small, and therefore genetic drift is a major factor in the determination
of allele frequencies.
e. Genetics is an unpredictable science.
C
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A. Classical B. Evolutionary C. Systematic D. Determinative
Put the following steps of the HIV life cycle in order:1.Viral
RNAs and proteins assemble into new viral particles that bud from the cell. 2.DNA copy of the viral genome is integrated into the host genome. 3.Viral reverse transcriptase makes a DNA copy of the viral RNA genome. 4.Viral particle enters the cell. 5.The provirus is transcribed into viral RNA genomes and mRNAs to make viral proteins.
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A. ubers. B. tendrils. C. rhizomes. D. stolons. E. rhizoids.
A pine tree is
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