I guess so, but I wonder sometimes if heredity is the major factor.
It depends on heredity, what you feed them, time of the year and a lot of other factors.
These are discussed under the headings Heredity; Mendelism; and Variation And Selection.
Instinctive behaviour thus depends solely on how the nervous system has been built through heredity; while intelligent behaviour depends also on those characters of the nervous system which have been acquired under the modifying influence of individual relation to the environment.
We do not yet know whether such absolute blending is possible or not, or whether all apparent blending is only a more or less minutely subdivided " mosaic " of non-combinable characters of the parents, in fact whether the combinations due to heredity in reproduction are ever analogous to chemical compounds or are always comparable to particulate mixtures.
If the earlier characters were not maintained by heredity why should the later be ?
But practical necessity has given rise to the existence of many other divisions; see CYTOLOGY, for the structure of cells; EMBRYOLOGY, for the development of individual organisms; HEREDITY and REPRODUCTION, for the relations between parents and offspring.
Now we know, from the numerous experiments in heredity which have resulted since the rediscovery of Mendel's principles, that an individual may carry a character in one of two conditions.
Saunders, "Experimental Studies in the Physiology of Heredity," Reports to the Evolution Committee of the Royal Society, Report I..
A similar kind of segregation may take place in the formation of the repeated parts of an organism, so that symmetrical repetition may be compared with normal heredity, and be due to the presence of similar factors in the divisions of the embryonic cells, whilst the differentiation of repeated parts may be due to the unequal distribution of such factors and be comparable with variation.
Bateson, Mendel's Principles of Heredity (Cambridge, 1909); E.
The general laws of heredity and variation have been proved to apply to man as well as to animals and plants.
It can hardly be said that the science has advanced beyond the stage of disseminating a knowledge of the laws of heredity, so far as they are surely known, and endeavouring to promote their further study.
The new constitution proclaimed the heredity of the Bohemian crown in the house of Habsburg.
The better we understand the laws of heredity and variation, and the more we learn of the history of the germ cells, the less need will there be to seek for explanations from telegony and other like doctrines.
At present, however, the theory of heredity is usually held in conjunction with Darwin's theory of natural selection; according to which different kinds of living things in the course of a series of generations come gradually to be endowed with organs, faculties and habits tending to the preservation of the individual or species under the conditions of life in which it is placed.
Unable to take Milan, Conrad issued in May 1037 an edictum de beneficiis, by which he decreed that the principle of heredity should apply in Italy to lands held by sub vassals,, and that this class of tenants should not be deprived e;f their lands except by the sentence of their peers, and should retain the right of appeal to the emperor.
Hence, at the end of the cth century, the heredity of offices as well as of fiefs.
Philips son was the first of the Capets who was not crowned during his fathers lifetime; a fact clearly showing that the principle of heredity had now been established beyond discussion.