When these blues are interbred,
one-quarter of their offspring will be white, which will prove to breed
true ever afterwards, one-quarter will be black that will breed true,
and fifty per cent. will be blue which will break up in the next
generation in the very same way as before. In this case neither white
nor black character is dominant, and accordingly we have a blending of
both in the first hybrid generation.
In guinea pigs, black color has been found to be dominant over white,
rough coat over smooth coat, and short hair over long hair. These
remarkable results following from an experimental trial of Mendelism
have stimulated hosts of investigators in all parts of the world, until
now many varieties of plants and animals have been studied for many
successive generations, already, building up a considerable literature
dealing with the subject.
Perhaps the most extensive and exact series of experiments along this
line have been carried on by Thomas Hunt Morgan and his assistants, of
Columbia University. For over five years they have been breeding the
wild fruit fly (_Drosophila ampelophila_), during which time they have
originated and observed over a hundred and twenty-five new types that
breed true according to Mendel's laws.
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