By Jay S Rosenblatt
Read Online or Download Advances in the Study of Behaviour: v. 10 PDF
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Extra resources for Advances in the Study of Behaviour: v. 10
T H E LIMITSOF PHYLOGENESIS We now can bring the components of fitness and the logic of phylogenesis to bear upon the key question of the extent to which it is possible for an evolving population to solve its adaptation problems exclusively by means of phylogenesis, and without its having to evolve additional information-gaining and -storing mechanisms. The limits of phylogenesis will be considered in terms of both the avoid-change and track-change strategies. 1 . Phylogenesis and the Avoid-Change Strategy It is probably never possible for members of a population to avoid environmental change completely.
1 . In this figure it is shown that the secondary and tertiary referents are not mutually exclusive. Thus, it is quite possible for a specific subsystem of the tertiary referent to be modified by epigenetic processes that are result from the secondary referent (Fig. 1 , Scheme 3). A distinguishing feature of PRIMARY REFERENT I SECONDARY I REFERENT TERTIARY REFERENT 11 I t y Genotype - 3 I I I I I x Genotypes I 1 - I 4 II y Phenotype J I x Phenotypes I I Fic. 1 . The nested relationship between the primary, the secondary, and the tertiary referents.
Because positive feedback is built into biological evolution with change inevitably generating further change, the potential lability of the environment is unlimited. This means that the demands for adaptations that an environment may make upon a population are also unlimited. In this case, what happens to a population that has already reached the upper limits to the amount or rate of change that it can cope with via phylogenesis, yet which is faced with a further increment in environmental change?
Advances in the Study of Behaviour: v. 10 by Jay S Rosenblatt