0 a cell connected with sexual reproduction, either a male sperm or a female egg
1 a male or female cell that can unite with a cell of the opposite sex for the purpose of reproducing
It is now quite commonly believed that this predisposition arises from the quantity rather than the quality or kind of factors in the chemical impetus in the nuclei of the conjugating gametes.
Pollen of an allied species which does not fuse with the female cell to make a gamete may, nevertheless, excite a female cell into division and the development of a tree.
