Biology Study Guide: How Populations Evolve Essay

“Testing Your Knowledge” section at the end: #s 13, 14 Exam questions are similar, but not exactly like these: One of the major sources of evidence for evolution is in the comparative anatomy of organisms. Features that look different but have similar structural origin are called A. Homologous structures. B. Analogous structures. Vestigial structures. D. Equivalent structures. Darwin proposed that individuals with traits that help them live in their immediate environment tare more likely to survive and reproduce than individuals without those traits.

He called this A. Natural selection. B. Arithmetic progression. C. The theory of evolution. D. Geometric progression. Darwin was greatly influenced by Thomas Malthusian who observed that A.

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Food supplies increase geometrically. B. Populations increase arithmetically. C. Populations are capable of geometric increase, yet remain at constant levels. D. The food supply usually increases faster than the population that depends on it. Selection that causes one extreme phenotype to be more frequent in a population is an example of A.

Disruptive selection. B. Stabilizing selection. C. Directional selection D. Equivalent selection. The flipper of a dolphin and the fin of a tuna are A. Homologous structures. C. Vestigial structures. D. Reciprocal structures. The northern elephant seal went through a severe population decline as a result of hunting in the late sass.

As a result of a hunting ban, the population has rebounded but is now homozygous for nearly every gene studied. This is the result of A. Mutation B. Natural selection C. Founder effect D. Bottleneck E. Gene flow A small, reproductively isolated religious sect called the Dunker was established by 27 families that came to the US from Germany 200 years ago. The frequencies for blood group alleles in this population differ significantly from those in the general US population. This is the result of A. Mutation Within a population, plants that produce an insect toxin are more likely to survive and reproduce than plants that do not produce the toxin.

This is the result of A. The gene pool of a population of bighorn sheep in the southwest US is altered when several animals cross over a mountain pass and Join the population. This is the result of A. Mutation During his voyage around the world, Charles Darwin was inspired to think about evolution by. A. Books that he read. B. Fossils that he collected. C. Studying adaptations of organisms to their environments. D. Unique organisms he saw in the Galapagos Islands. E. All of the above. Breeding of plants and animals by humans is called A. Natural selection. B. Sexual recombination. C. Founder effect. D. Artificial selection. E. Neutral variation.

Which of the following generates variation within a population? A. Natural selection B. Genetic drift C. Mutation Which of the following results in adaptation to the environment? A. Natural selection B. Mutation C. Emetic drift D. Recombination E. Founder effect The smallest unit that can evolve is a A. Species. B. Genotype. C. Gene. D. Population. E. Individual. The ultimate source of all genetic variation is B. Genetic drift. C. Sexual recombination. D. The environment. E. Mutation Organisms that possess homologous structures probably A. Are headed for extinction. B. Evolved from the same ancestor. C. Have increased genetic diversity. D. By chance had similar mutations in the past. E. Are not related.

Sexual recombination occurs when chromosomes are shuffled in mitosis. C. Natural selection. D. Mutation. E. Meiosis. Darwin A. Was the first person to conceive that organisms could change over time. B. Believed that organisms could pass on acquired changes to offspring. C. Was eager to publish his theory so that he could get all the credit. D. Worked out the mechanisms of evolution-?natural selection. E. Was the first to realize that fossils are remains of ancient life. In a population of black bears, which would be considered the fittest? A. The biggest bear B. The bear having the largest number of mutations C. The bear that blends in with its environment the best D. He strongest, fiercest bear E. He bear that leaves the most descendants Blue poppies native to China are grown at a plant-breeding center in California, where those with the thickest leaves survive and reproduce best in the drier climate. This evolutionary adaptation of the poppies to their new environment is due to A. Genetic drift. C. Directional selection. D. Neutral variation. E Disruptive selection. Which of the following would result in evolutionary adaptation of a mouse population to its environment? A. Half the mice are killed by an avalanche. B. A mutation for spotted fur occurs. C. Several mice leave the area and mate with individuals elsewhere. D. Mice with thicker fur best survive a cold winter. E.

Mice are most likely to mate with close neighbors. Each of us is part of the ongoing evolution of the human species. Which of the following occurrences would have the greatest impact on the future biological evolution of the human population? A. You work out every day so that you stay physically fit and healthy. B. A mutation occurs in one of your skin cells. C. You move to Hawaii, the state with the longest life expectancy. D. A mutation occurs in one of your sperm or egg cells. E. You encourage your children to develop their intellectual abilities. Natural selection is sometimes described as “survival of the fittest. ” Which of the following best measures an organism’s fitness? A.

How strong it is when pitted against others of its species. B. How many fertile offspring it produces. C. Its mutation rate. D. How much food it is able to make or obtain. E. Its ability to withstand environmental extremes. And generate variation, while results in adaptation to the environment. A. Genetic drift natural selection mutation B. Mutation sexual recombination natural selection C. Overproduction of offspring … Mutation sexual recombination D. Natural selection mutation sexual recombination E. Sexual recombination natural selection mutation Which of the following did not influence Darwin as he synthesized the theory of evolution by natural selection? A.

Examples of artificial selection that produce large and relatively rapid changes in domesticated species B. Allele’s Principles of Geology, on gradual geologic changes C. Comparisons of fossils with living organisms D. The biographic distribution of organisms, such as the unique species on the Galapagos Islands E. Mender’s paper describing the laws on inheritance In an area of erratic rainfall, a biologist found that grass plants with alleles for curled leaves reproduced better in dry years, and plants with alleles for flat leaves reproduced better in wet years. This situation would tend to . A. Cause genetic drift in the grass population B. Preserve genetic variation in the grass population C.

Lead to stabilizing selection in the grass population D. Lead to uniformity in the grass population E Cause gene tool in the grass population Which of the following pairs of structures is least likely to represent homology? A. The hemoglobin of a human and that of a baboon B. The mitochondria of a plant and those of an animal C. The wings off bird and those of an insect D. The tail off cat and that of an alligator E. The foreleg off pig and the flipper of a whale Darning’s claim that all life is descended from a common ancestor is best supported with evidence from B. Molecular biology. C. Evolutionary trees. D. Comparative anatomy. . A. The fossil record. E. Comparative embryology.

Within a few weeks of treatment with the ETC for the HIVE virus, a patient’s HIVE population consists entirely of ETC-resistance viruses. How can this result best be explained? A. HIVE can change its surface proteins and resist vaccines. B. The patient must have become reinforced with a resistant virus. C. A few drug- resistant viruses were present at the start of treatment, and natural selection increased their frequency. D. The drug caused the HIVE genes to change. E. HIVE began making drug-resistant versions of its enzymes in response to the drug. Of the following possibilities, the best way to estimate an organism’s evolutionary fitness is to measure the A.

Size of its offspring B. Number of eggs it produces C. Number of eggs it produces over its lifetime D. Number of offspring it produces over its lifetime E. Number of offspring it produces over its lifetime that survive to breed In many species of fireflies, males flash to attract females. Each species has a different flashing pattern. This is probably an example of A. Ecological isolation B. Temporal isolation C. Geographical isolation D. Posthypnotic isolation After the demise of the dinosaurs, mammals evolved rapidly into many new forms because of A. The founder effect B. A genetic bottleneck C. Adaptive radiation D. Geological time E. Genetic drift

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