Now, what is the chance that the child draws a white bean from both

baskets? Evidently it is one chance in four; for there are four ways
equally probable in which you can take these beans, viz
Now, what is the chance that the child draws a white bean from both
baskets? Evidently it is one chance in four; for there are four ways
equally probable in which you can take these beans, viz.: (1) black from
the father basket and black from the mother, (2) white from the father
and white from the mother, (3) white from the father and black from the
mother, (4) black from the father and white from the mother. So the
children could draw both white once in four times, both black once in
four, and a white and a black in the other two cases. And that is why
from two blue Andalusian fowls, on the average you will have one-quarter
of the children black, one-quarter white, and the other two-quarters,
blue. Again let us stop to emphasize the fact that the black children of
these hybrids are just as pure blooded as their black grandparent, and
will mate with other pure-blooded black in exactly the same way as
though there had never been any white in their ancestry. The white
strain has been left behind, or been 'bred out.'