EVOLUTION
EVIDENCE FOR EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Environments with more organisms tend to have more successful species.
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Species with greater genetic diversity adapt more easily to changing environments.
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Changing environments prevent species from adapting and surviving.
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Species in a stable environment are more resistant to a changing environment.
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Detailed explanation-1: –Species today descended with modifications from ancestral species. This answer represents evolution as a whole, not the process of natural selection. Theodosius Dobzhansky discovered that successful species tend to have a wide variety of genes that do not appear to be useful to the species in its present environment.
Detailed explanation-2: -Dobzhansky helped discover that different fruit fly populations have different frequencies of two different versions of the same chromosome; chromosome A might be more frequent in one population while chromosome A’ is more frequent in a neighboring population.
Detailed explanation-3: -Dobzhansky defined species as “that stage in the evolutionary process at which the once actually or potentially interbreeding array of forms becomes segregated in two or more separate arrays which are physiologically incapable of interbreeding” (37; also ref. 1, p. 312).
Detailed explanation-4: -In the 1973 article, Dobzhansky placed special emphasis on common ancestry as evidence for the existence of evolution, since adaptation to the environment would be expected both under selection and under separate creation of the species (Griffiths 2009, p. 13).
Detailed explanation-5: -Dobzhansky’s work with Drosophila, or fruit flies, provided new evidence that supported Darwin’s theory that natural selection, acting on genetic variation in populations, is a driving force in evolution.