stated in his acceptance speech for the. Collin, Rachel; Miglietta, Maria Pia (November 2008). Hendry, Andrew Paul; Kinnison, Michael. New York: Springer-Verlag New York. In the plant genus Tragopogon, two new species have evolved within the past 50-60 years. The time for a neutral allele to become fixed by genetic drift depends on population size, with fixation occurring more rapidly in smaller populations. For instance in humans, every chromosome is paired, one inherited from the mother, the other inherited from the father. Australopithecus afarensis, Homo habilis and, homo erectus.
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"Précis of Evolution in Four Dimensions". Assembling the Tree of Life. The probability of a neutral allele fixing in a population is equal to its frequency. In any case, the radiation produced a wide variety of animals. "The frailty of adaptive hypotheses for the origins of organismal complexity". 159 It is usually difficult to measure the relative importance of selection and neutral processes, including drift.
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