II. The offspring may resemble one parent in some characters and the
other in other characters. They may have, for example, the colour of one
parent, the shape of the other, and so on. Thus if a pure, albino,
long-haired, and rough-coated male guinea-pig be crossed with a coloured,
short-haired and smooth-coated female, all the offspring are coloured,
short-haired, and rough-coated. That is to say, they take after the
father in being rough-coated, but after the mother in being pigmented and
short-haired. This form of inheritance is usually seen only in crosses
between two types which differ in but few of their characters.
III. The offspring may display a blend of the characters of the two
parents. They may be intermediate in type. They are not of necessity
midway between the two parents; one of the parents may be prepotent. The
crosses between the horse and the ass show this well. Both the mule,
where the ass is the sire, and the hinny, where the horse is the sire,
are more like the ass than like the horse; but the hinny is less ass-like
than the mule. The offspring between a European and a native of India
furnishes a good case of blended inheritance; Eurasians are neither so
dark as the Asiatic nor so fair as the European.
IV. The offspring may show a peculiarity of one parent in some parts of
the body and the peculiarity of the other parent in other parts of the
body. This is known as particulate inheritance. The piebald foal, which
is the result of a cross between a black sire and a white mare, is a good
example of such inheritance. This does not appear to be a common form of
inheritance.
V. The usual kind of inheritance is perhaps a combination between the
forms II. and III. In such cases the offspring display some paternal
characters and some maternal ones, and some characters in which the
maternal and paternal peculiarities are blended. An example of
inheritance of this description is furnished by a cross between the
golden and the amherst pheasants.
VI. The offspring may be quite unlike either parent. For example, Cuénot
found that sometimes a grey mouse when crossed with an albino produces
black offspring.
Mendel’s Experiments
The first two kinds of inheritance were carefully investigated by Gregor
Johann Mendel, Abbot of Brunn. The results of his experiments were
published in the Proceedings of the Natural History Society of Brunn, in
1854, but attracted very little notice at the time.
Public-domain text, read in full here on John Shaqi.
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