Biology S2- II: Question Preview (ID: 10048)


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Which are two ways a population can decrease in size?
a) immigration and emigration b) increased death rate and immigration c) decreased birthrate and emigration d) emigration and increased birthrate
On the Galápagos Islands, Charles Darwin observed
a) completely unrelated species on each of the islands. b) species exactly like those found in South America. c) somewhat similar species with traits that suited their particular environment. d) species completely unrelated to those found in South America.
Darwin viewed the fossil record as
a) evidence that Earth was thousands of years old. b) a record of evolution. c) interesting but unrelated to the evolution of modern species. d) evidence that traits are acquired through use or disuse.evidence that traits are acquired through us
If an allele makes up one fourth of a population’s alleles for a given trait, its relative frequency is
a) 0% b) 25% c) 50% d) 75%
The two main sources of genetic variation are
a) genotypes and phenotypes. b) gene shuffling and mutations. c) single-gene traits and polygenic traits. d) directional selection and disruptive selection.
Natural selection acts directly on
a) genes b) alleles c) phenotypes d) mutations
The separation of populations by barriers such as rivers, mountains, or bodies of water is called ____________ isolation.
a) behavioral b) temporal c) geographic d) equalibrial
Examples of fossils include preserved
a) eggs b) footprints c) body parts d) all of the above
What is the basic unit (cell) of the nervous system?
a) receptor b) neuron c) organ d) tissue
The process by which organ systems maintain a relatively constant internal environment is called
a) circulation b) homeostasis c) teamwork d) organization
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