Auralia wrote:Not sure I understand what you're saying.
Sperm and egg cells are independently-living organisms with human genetic material - they are really not very different from zygotes in every way that matters, particularly since eggs can be induced to form a zygote without the intervention of sperm.
Strikes me as an attempt to impress upon the reader the importance of that step in development, particularly since none of them make value judgments about what that step means.



