Not to mention that I don't know why you're asking the above, you did not answer my previous query, which, in itself, was asked about several days ago.
Your previous post has no mention of the processes leading up to gastrulation, nor does it mention anything about how long it takes for the father's genetic material to combine fully with the mother's. I stated that (from the WiKi article, which has a citation link, which also happens to be where you sourced the material for your earlier post) the genetic material from the sperm hasn't completed combination with that from the mother until the 16th day. This is an important distinction because only after the genetics of the offspring is determined, will it be capable of being considered an individual.
I should have clarified this in my previous post, that your earlier post didn't answer what was argued a couple of days ago, but this should suffice.
By the way, a zygote has unique DNA.
This was not the argument. The argument was revolving around when the father's genes have completed involving themselves with those of the mother's. Just the entry of the sperm into the egg, isn't the instant when an individual is genetically determined.
Citation: Moore, K. L. & T. V. M. Persaud (2003). The Developing Human: Clinically Oriented Embryology. W. B. Saunders Company. ISBN 0-7216-6974-3.
If you have access to a journal, perhaps you can look it up. I don't, for now.
At the point where the surface of the egg changes and no other sperm can enter, yes, it is the instant when an individual is genetically determined. It similar to if someone pushed you off of a very tall building. At the point where you can no longer be pulled back or hang on and start falling unstoppably to the ground is the point at which your death is determined, even if you don't actually die until you hit the pavement below. It's also why pushing you off of the building would be considered murder, even though the push and the fall didn't kill you, the sudden deceleration at the end did.
Of course this whole objection is entirely irrelevant because the distinction you are looking for matters only if someone were to hover above an egg as it was being fertilized and were to destroy it between the point the first sperm entering the egg and the comination of the genetic material from sperm and egg. This will never happen in practice and is thus irrelevant, just as the determining the point at which you'd actually die if you fell to the ground from a high height between the moment when the first part of your body hit the ground and the point where your remains where liquified and distributed across a broad area is irrelevant because nobody is going to every stop that process in the middle in a way where it will matter. This is the classic post-modern strategy to dismissing anything. Insist on looking only at the trees and then claim the forest doesn't exist.
“the genetic material from the sperm hasn’t completed combination with that from the mother until the 16th day”
Sorry, but that simply is not true. A zygote, at the single cell stage has unique DNA, a full compliment of 46 chromosomes that idenitify it as a unique individual. Combination of DNA is complete before the first division begins. The zygote is a totipotent cell and its unique DNA signature is carried forth in every division from that point forward.
Do feel free to provide some credible science that states explicitly that the offspring of two human beings is ever anything but a human being.