Term
| the study of the genetic variability within a population and the forces that change allele |
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| the study of the geographical distribution of species is called |
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| the evolution of new species is called |
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| which of the following types of reproductive barriers separates two flowering plant species that could interbreed except that one has a deep flower tube and is pollinated by bumblebees, whereas the other has a short, narrow flower tube and is pollinated by honeybees |
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| which of the following would seem to be an example of neutral variation |
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| the monterey pine and bishop's pine inhabit some of the same areas of central California. the monterey pine releases pollen in February, while the Bishop's pine does so in April. this is an example of_______isolation |
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| which of the following types of reproductive barriers separates a pair of species that could interbreed except that one mates on goldenrod flowers and the other on autumn daisies that blossom at the same time |
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| evolutionary modifications that improve the survival and reproductive success of an organism are called |
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| polyploidy is much more common in |
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| speciation that involves a population that has become separated from the rest of the species by a geographical barrier that prevents gene flow, and that evolves into a new species, is called_____speciation |
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| which characteristic is NOT one of the five conditions for the Hardy-Weinberg equilibrium |
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Definition
| the population must be small |
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| aristotle believed which of the following |
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Definition
| species are fixed (permanent) and do not evolve |
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| breeds of dogs, such as german shepherds and saint bernards, occur as a result of |
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| which of the following are the main ideas that darwin advanced in his works |
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Definition
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Definition
| a group of individuals of the same species living in the same place at the same time |
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Term
| a gene pool consists of all the |
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Definition
| alleles of all the genes of all the members of a population |
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Term
| which of the following constitutes a basic, modern definition of a "biological species" |
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Definition
| a population that interbreeds and produces fertile offspring |
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Term
| when the continent of pangaea first split apart, it formed |
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Definition
| northern landmass called laurasia and a southern landmass called gondwana |
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Term
| which of the following is NOT an example of a postzygotic barrier |
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Definition
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Term
| darwin's theory of natural selection to explain evolution is also known as |
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Definition
| descent with modification |
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Term
| in a particular environment, there are no obvious fitness differences among individuals with dark hair and individuals with light hair. the term that best describes this situation is |
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Definition
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Term
| in________ selection, individuals with a phenotype near the mean are favored over those at the phenotypic extremes |
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Definition
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Term
| if two species have incompatible mating structures, then_______ will prevent them from mating |
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Definition
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Term
| which of the following processes adds new alleles to the gene pool |
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Definition
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Term
| not infrequently, a group of related species will each have a unique courtship ritual that must be performed correctly for both partners to be willing to mate. such a ritual constitutes a type of |
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Definition
| behavioral isolating mechanism |
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Term
| the emergence of numerous species from a common ancestor that finds itself in a new and diverse environment is called |
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Definition
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Term
| movement of alleles between populations such as by the migration of breeding individuals is called |
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Definition
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Term
| an elk herd is observed over many generations. most of the full-grown bull elk have antlers of nearly the same size, although a few have antlers that are significantly larger or smaller than this average size. the average antler size remains constant over the generations. which of the following effects probably accounts for this situation |
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Definition
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| a change in the position of continents resulting from slow movement of the plates of Earth's crust on the underlying molten mantle is called______ |
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| the term used to describe an event where many species die out over a short period of time is called_____ |
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Definition
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| if an earthquake hit a small island so that all but a tiny group of lizards were eliminated and the survivors spread out over the island, this would be a demonstration of____ |
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Definition
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| a population of squirrels is preyed on by small hawks. the smaller squirrels can escape into burrows. the larger squirrels can fight off the hawks. after several generations, the squirrels in the area tend to be very small or very large. of what process is this an example |
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Definition
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Definition
| genetic change in a population or species over many generations |
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Term
| the oldest fossils usually________ |
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Definition
| are found in the deepest strata |
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Term
| of the galapagos islands, charles darwin questioned why |
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Definition
| the island species resembled those from south america |
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Term
| which of the following developed a theory of evolution identical to darwin's |
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Definition
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Term
| natural selection targets_____ |
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Definition
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| speciation without geographic isolation is called______speciation |
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Definition
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Term
| genetic drift resulting from a disaster that drastically reduces population size is called |
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Definition
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Term
| evolutionary change as a result of natural selection always leads to |
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Definition
| better phenotypes suited for the environment |
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