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Ch. 8 Evolution
Ch. 8 Evolution
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a variant form of a single gene
model for the origin of a new species from a small population that become isolated from its parent population
body part, such as the wings of insects and birds, that serves the same function but differs in structure and development
the practice of selectively breeding plants and animals with desirable traits
complex, double stranded, helical molecule of DNA specific segments of chromosomes are genes
type of analysis of organisms in which they are grouped together on the basis of derived as opposed to primitive characteristics
diagram showing the relationships among members of a clade, including their most recent common ancestor
origin of similar features in distantly related organisms as they adapt in comparable ways,
diversification of a species into two or more descendant species
body part in different organisms with similar structure, similar relationships to other organs, and similar development but does not necessarily serve the same function
inheritance of aquired characteristics
Jean Baptiste de Lamarck's mechanism for evolution, holds that characteristics acquired during an individual's lifetime can be inherited by descendants
an existing organism that has descended from ancient ancestors with little apparent change
evolutionary changes that account for the origin of new species, genera, orders, and so on
greatly accelerated extinction rates resulting in marked decrease in biodiversity
evolutionary changes within a species
combination of ideas of various scientists yielding a view of evolution that includes the chormosome theory of inheritance, mutation as a source of variation, and gradualism
concept holding that not all parts of an organism evolve at the same rate, thus yielding organisms with features retained from the ancestral condition as well as more recently evolved features
any change in the genes of organisms; yields some of the variation on which natural selection acts
mechanism accounting for differential survival and reproduction among members of a species
evolution of similar features in two separate but closely related lines of descent as a result of comparable adaptations
concept that a species evolves gradually and continuously as it gives rise to new species
concept holding that new species evolve rapidly, in perhaps a few thousands of years, then remains much the same during its several million years of existence
theory of evolution
holds that all livings things a re related and that they descended with modification from organisms that lived during the past
any structure that no longer serves any or only a limited function, or a different funciton
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