New genes are thought to arise by which mechanism?
A) Gene duplication followed by divergence due to mutation.
B) Fusion of two genes due to mating between individuals of two different species.
C) Conversion of introns to exons by the accumulation of mutations.
D) Mutation of a DNA sequence activates a gene that was previously turned off.
A) Gene duplication followed by divergence due to mutation.
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In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food. This would lead to ____ in the ancestral giraffe population.
A. disruptive selection B. directional selection C. sexual selection D. genetic drift E. stabilizing selection
Which of the following will not result from site-specific recombination?
A. inversion B. deletion C. insertion D. translocation E. All of the choices given can occur.
Pseudonocardia is an organism that is hosted by
A. ants that cultivate fungal gardens. B. wood-eating insects. C. people with severe acne. D. marine invertebrates.
Fast-twitch fibers contain large amounts of myoglobin and predominate in "red" muscle
Indicate whether the statement is true or false