(Servicio de Publicaciones de la Universidad de Navarra, 1974) Jordana, R. (Rafael); Herrera-Mesa, L. (Luis)
The present article is an explication for wide scale publication, of the process
of reproduction in the animal world -from the protazoas to the mamals.
The similarity of reproduction in the zoological world is manifested to the
reader. Essentially, the basic and intimate mechanism of the reproductive process
is the same in all animals. It only varies accidentally as a response to the adaptation
to distinct modes of life. The principal moment of the reproductive process
is the appearance of the new individual, in the form of a zygote or egg, which is
formed by the union of the gametes. From the first moment, it has its own genetic
information which makes it distinct from its progenitors. In the majorityof animals,
it begins an embryonic development, in independence from its parents. Only in a
few cases, the embryo, by adaptation to a determined type of environment, is dependent
upon the mother.
