A shift from expected allele frequencies, resulting from chance, is known as
(a) natural selection.
(b) genetic drift.
(c) mutation.
(d) gene flow.
(b) genetic drift.
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Why doesn't inbreeding depression, by itself, cause evolution?
A) It decreases the population's average fitness. B) It limits gene flow. C) It does not change the population's allele frequencies. D) It increases homozygosity. E) It violates the Hardy-Weinberg assumptions.
Both plants and animals possess mitochondria, which are used for cellular respiration to make ATP
Indicate whether the statement is true or false.
Nonscientists often use the words "name," "identify," and "classify" interchangeably. When they want to know what an organism is, they may ask "Can you name this?" or "Can you identify this?" or "Can you classify this?" Which of the following is/are correct usage(s) of the term(s)?
A. A farmer using a key to detect pest insect species in his fields is identifying insects but not naming or necessarily classifying them. B. Classifying is grouping, and to classify something requires several organisms so you can group one as closer to a second and distant from a third. C. A scientist who publishes the name and description of a new species must necessarily also know both how to identify and classify the species. D. Only the scientist who first describes a new species actually names it. E. All of the choices are correct.
If the plants in a community produce 500 grams of organic matter per square meter per year that is available for animals in the community to eat, this amount of energy is known as the
A) availability factor of the community. B) trophic factor of the community. C) net primary productivity of the community. D) consumership of the community. E) secondary productivity of the community.