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Isozymes in Plant Biology (Hardcover, 1989 ed.)
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Isozymes in Plant Biology (Hardcover, 1989 ed.)
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which individuals are heterozygous (H). A review by Selander (1976]
comparing these param eters in various populations has been
followed by many other studies. In the present volume, J. B. Mitton
has used H to evaluate the importance of heterozygosity in natural
populations. The degree of polymorphism expressed by P, has been
used in several contributions to approach various problems of
population genetics. particularly breeding structure and mating
systems by Hamrick, Barrett and Shore, Brown, Burdon and Jarosz. as
well as Soltis and Soltis, and Wyatt. Stoneburner. and Odrzykoski.
New knowledge derived from these investigations has strengthened a
point of view already stressed by Darwin: evolution takes place in
a complex environment, that can be constantly changing over long
periods of time. or can alternate between long periods of relative
stability and cycles of rapid change. The most successful plant
species become adjusted to these vagaries in several ways,
including shifts in heterozygosity. polymorphism and mating
systems. The strength of isozyme ana ysis for testing hypotheses is
well illustrated by the contribution of the Soltises, who have
shown clearly that a previously held hypothesis, predicting self
fertilization fortified by polyploid genetic segregations in ferns,
must be rejected."
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