Page:Mendel's principles of heredity; a defence.pdf/88

68 The artificially fertilised seeds were sown together with several seeds of both original stocks, and the most vigorous examples were chosen for the reciprocal crossing. There were fertilised:


 * 1) The hybrids with the pollen of AB.
 * 2) The hybrids ❞❞ ab.
 * 3) AB ❞❞ the hybrids.
 * 4) ab ❞❞ the hybrids.

For each of these four experiments the whole of the flowers on three plants were fertilised. If the above theory be correct, there must be developed on the hybrids egg and pollen cells of the forms AB, Ab, aB, ab, and there would be combined: —


 * 1) The egg cells AB, Ab, aB, ab with the pollen cells AB.
 * 2) The egg cells AB, Ab, aB, ab with the pollen cells ab.
 * 3) The egg cells AB with the pollen cells AB, Ab, aB, ab.
 * 4) The egg cells ab with the pollen cells AB, Ab, aB, ab.

From each of these experiments there could then result only the following forms: —


 * 1) AB, ABb, AaB, AaBb.
 * 2) AaBb, Aab, aBb, ab.
 * 3) AB, ABb, AaB, AaBb.
 * 4) AaBb, Aab, aBb, ab.

If, furthermore, the several forms of the egg and pollen cells of the hybrids were produced on an average in equal numbers, then in each experiment the said four combinations