If there is gene flow between two adjacent populations of the same species, then the two populations will
A. become isolated from each other.
B. develop into different species.
C. have similar gene pools.
D. adapt to different conditions and become separate.
Answer: C
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Consider the example of sickle-cell anemia and the allele for the sickle-cell trait, and answer the following
t or f: Eventually, natural selection will typically result in the sickle-cell allele being fixed in the population. t or f: Selection at this locus is an example of disruptive selection. t or f: This is an example of stabilizing selection and will decrease the variation at this locus in the population. t or f: This is an example of stabilizing selection and will maintain variation at this locus. t or f: Hypothetically, if homozygous recessives had the highest fitness (i.e. selection was directional) of the three genotypes discussed in the text, then natural selection would lead to fixation of the sickle-cell allele. What will be an ideal response?
The ________ is the respiratory center that appears to facilitate the transition between inspiration and expiration.
A) ventral respiratory group B) central pattern generator C) dorsal respiratory group D) pontine respiratory group E) medullary respiratory group
In order to fit within a cell, DNA becomes more compact by
A.) breaking apart into separate genes B.) extending to form very long, thin molecules C.) wrapping tightly around histones D.) being enzymatically changed into a protein
Which eye color has dense melanin deposits in the iris?
A. Blue B. Gray C. Brown D. Green E. Brown and blue