The one that is a thoroughbred will behave like a thoroughbred. For
instance, if mated with white they will have nothing but black children.
But if one that is hybrid black mate with one that is white, only half
of the children will be white; these white children reveal the fact that
their black parent was a half breed. Then we can put a tag on that black
parent. If proper tags are put on the blacks so as to distinguish
between the pure-blooded and the half-blooded--say a blue tag on the
hybrids and a black on the thoroughbreds--we shall get exactly the same
results as described in the case of the Andalusian fowl, in the six
cases mentioned. The same principles apply to qualities of the guinea
pigs other than color. Thus, if a long-haired guinea pig mates with a
short-haired guinea pig, all the offspring will be short-haired, because
short hair is dominant over long hair. Again, if a smooth-coated guinea
pig mates with a rough-coated one, the result will be rough coated,
because a rough coat is dominant over a smooth coat.
