Courtship for Anolis lizards involves the male displaying a dewlap (skin under the throat area) that varies in appearance based upon the species. Lizards that are found in darker, more shaded environments will have dewlaps that are lighter in color because they are more noticeable by potential mates. Which of the following mechanisms best explains how speciation is at work in this example?

A. Genetic drift
B. Postzygotic isolation
C. Natural selection
D. Reinforcement


Answer: C

Biology & Microbiology

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One goal of pedigree analysis is to discover whether the gene in question is located on an X or a Y chromosome or on a(n) ____________________

Fill in the blank(s) with correct word

Biology & Microbiology

The ________ pathway of viral replication incorporates the viral DNA into the host's DNA. a. None of these choices

b. lysogenic c. pandemic d. epidemic e. lytic

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A cohort is ____

a. a group of individuals of the same species born during the same time interval b. any member of the same species c. a group of individuals with the same parents d. a group of individuals of the same sex e. any group of closely related individuals

Biology & Microbiology

Which of the following represents the possible genotype(s) resulting from a cross between an

individual heterozygous (Bb) and one that is homozygous (bb)? a. BB and Bb b. Bb and bb c. BB only d. Bb only e. bb only

Biology & Microbiology