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.
In the articles Reproduction and Heredity the details of the relations between parent and offspring are discussed.
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.
The operation of Mendelian processes in human heredity is further shown by the close relationship that exists between the appearance of albinoes and cousin marriages.
Albinism appears, in the processes of heredity, to be sometimes indissolubly correlated with certain peculiar traits.
Saunders, "Experimental Studies in the Physiology of Heredity," Reports to the Evolution Committee of the Royal Society, Report I..
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 history of this family, the Rougon-Macquart, was to be told in a series of novels containing a scientific study of heredity - science was always Zola's ignis fatuus - and a picture of French life and society.
They are subjects for a scientific psychology employing the historical method with the conceptions of heredity and development, and calling to its aid, as such a psychology will do, the investigations of all the sociological sciences.
But even were the laws of heredity and variation better understood, the fact remains that we know little of the origin of the majority of our domestic animals.