By Rosenbaum

As an creation to rules of evolution, this paperback textual content is ideal as a chief textual content for common evolution or as a complement for normal biology, genetics, zoology, botany, anthropology or any lifestyles technology path that makes use of evolution because the underlying topic.

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Extra resources for Volpe's Understanding Evolution, 7th Edition

Example text

In the most elementary case of inheritance, the trait is governed by a single gene that exists in two allelic forms—the normal (or typical) allele and the variant (or mutant) allele. Albinism in humans may be taken as an example of a trait under the simple control of a pair of alleles. The word albino is derived from the Latin albus, meaning “white,” and refers to the paucity or absence of pigment (melanin) in the skin, hair, and eyes. The skin is often very light (“milk white”), and the hair whitish yellow.

3 Curious hoofed mammals (ungulates) that flourished on the continent of South America some 60 to 70 million years ago and have long since vanished from the scene. Bones of these great mammals were found by Darwin on the flat treeless plains of Argentina. ” What Darwin had realized was that living species have ancestors. This fact is commonplace now, but it was a revelation then. On traveling from the north to the south of South America, Darwin observed that one species was replaced by similar, but slightly different, species.

In fact, the actual size of a given population of any particular organism remains relatively constant over long periods of time. Darwin’s third observation was that there are only a limited amount of resources available for organisms to use as they strive to live and reproduce. If we accept these readily confirmable observations, the conclusion necessarily follows that not all individuals that are produced in any given generation can survive. There is inescapably in nature an intense “struggle for existence” (deduction 1).

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