By Jay S Rosenblatt
Read 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
An x genotype is one with invariant translation into a phenotype. A y genotype has flexible development. An x phenotype is inflexible. A y phenotype has independent information-gainingprocesses. Scheme 1 . Genotype-phenotype translation is invariant and the phenotype inflexible. All information gain is confined to the primary referent. Scheme 2. Genotype-phenotype translation is flexible, but postdevelopment the phenotype becomes inflexible. Information gain is confined to the primary and secondary referents.
Thus, a special case of the general limitation imposed by the primacy of S operates upon the variance that can be supplied by genetic mechanisms since the internal stability of the genotypes must be maintained at all times if the members of the population are to remain viable. A secondary means of increasing variants is simply to increase the number of offspring in each generation and thus to increase both the genotypic and phenotypic range. But here too there are limits to such a solution. First, the environment must be able to support the increase in numbers.
This fact has been mentioned before, but it needs to be strongly stressed. It means that, although the secondary and tertiary referents will always depend on phylogenetically supplied innate generalist mechanisms, there is no logical reason why these mechanisms should turn out to be the same kind of mechanisms in every population in which they occur. On the contrary, all innate adaptability mechanisms must be population or species specific, which means that their operating characteristics and their tolerance limits must also be species specific.