This is also what I remember. Hathor says she needs "The code of life"=DNA to incorporate into the symbiotes, for them to easier take a host.I think the large part of what we see of both Egeria and the other queen that worked for Anubis, is an external egg sack/womb. It is not something they "bring with them" into the host, as can be seen when Kelmaa gives her host to Egeria - the egg sack is still in the tank. I have seen it speculated several places that they use "what is already there" when they have a host (female of course), and otherwise grow an egg sack/external womb.
Regarding Hathor's need for human DNA - she said it was to assure compatibility with the host species, so she would not be the only queen to need that. It probably guarantees that the symbiote doesn't get rejected by the host body, because it is already part human and thus recognized by the body. Neither Egeria, nor Anubis's queen were making symbiotes that were going to live for long in a host - Egerias where used to make medicin and Anubis probably didn't care if only some of the symbiotes survived long enough to control his Kull warriors - which were totally constructed anyway.
There is also the comment from Klorel about his father, Apophis: "he seeded the queen mother" - so it would seem they cross-breed with the host species to assure the symbiote does not have problems with the immune system of the host?
Yes, the only way it can make a difference whether it is one or two hosts that are parents, is if the symbiote in the male also somehow transfer DNA. I'm willing to go for the "DNA attaches itself to semen" theory.It is unknown if Jaffa can have children with others - they are genetically engineered, no one knows how much they are changed. I would guess that human/symbiote (in hosts, mind you) would have no problems, given that they already cross-breed when producing symbiotes.
The genetic memory: Since it is genetic memory, and since they said that the child was only considered a harsesis when he or she had two parents which were hosts, it follows that BOTH symbiotes must provide DNA, otherwise it makes no sense. The thing about the child having all the knowledge of the Goa'uld must be superstition - it could at most get the knowledge from both sides of its parentage, and if the symbiotes were from different queens, then they could get twice as much as an ordinary Goa'uld - something which Apophis apparently coveted.
This must mean that the child should always get some genetic memory, even if only one parent is a host (namely the memory of that symbiote), so the child of a Tok'ra and a human would get the Tok'ra's memories. Since the Tok'ra are good guys, I wouldn't consider that a problem, but they may want to keep the child away from any Goa'uld which would want to get to the knowledge (of course, they could get much of that by killing the symbiote in a Tok'ra host, and putting a Goa'uld in the poor guy).
No idea how the DNA from the symbiotes get into the child, but we have been told that both DNA and proteins from the symbiote is flowing around in the blood of the hosts, so perhaps it also goes other places and attaches itself to egg/semen. Who knows.
I'm not so sure about that. I don't think the naquadah stores anything, mostly because we had the cloned symbiotes in one episode of SG-1 (the ones that were building a ship, but were too young to take control of their hosts while the host was awake, and thus were building at night). These symbiotes DIDN'T have any naquadah (Sam said that was why neither she nor Teal'c could sense them), but they still had all the genetic memory. We have also been told that the reason they can sense each other is that naquadah "resonates" with itself - Hathor could even feel the Stargate all the way to South America!!We know they are able to access all the host's memories, and it goes the other way as well, and the influence remains after death of one party. I'd say that the symbiote either uses naquadah or a chemical/neurotransmitter that has a byproduct of naquadah to imprint memory patterns onto the host's neurons as well as to establish a link between their neurons for future interaction. In short, the symbiote acts like an external hard drive on a computer and copies over its information, and then makes it so that both minds are in sync.
Now, in theory the symbiote could control the body by only interacting with the brain, and any special chemical/neurotransmitter would stay there because of the blood/brain barrier. However, we see that that is not the case, and it makes sense. For a queen to breed, it would need to use the body of the host, and so there would have to be more direct interaction with the body. Hence the naquadah (or whatever it is) that is found in the bodies of those who are or were hosts. The symbiote must put a command in the host's brain that makes the necessary changes, which is why past hosts continue to produce naquadah, and those changes must be necessary for the incubation of newborn symbiotes.
Okay, now I'll go off on a wild whim to explain the whole harcesis thing, but it's related to my above theories. If the chemical that the symbiote uses to blend the minds of host and symbiote is powerful enough to "copy" memories, and if that chemical is required for the incubation of symbiotes (my theory), then perhaps when the womb is used for the incubation of human children, the chemical "copies" the memories into the mind of the human child because of the link between the other two minds. The symbiote could control what information the symbiote children received, but the human fetus' mind would automatically get the knowledge of host and symbiote because the chemical is designed to blend with humans and "sync" their minds. Does that make sense?
Also, it is not just human children of hosts to queens that get the genetic memory, it is human children of hosts to ordinary symbioted too - and they wouldn't have made any changes to the womb of the host, as only the queen would use it for her larvae.
I like your idea about why they can control the genetic memory in the symbiote kids, but not in the human kids - that they are designed to sync to humans mind. I think it would work whether it is DNA or naquadah that is the reason. Can queens control the memory of human children? Perhaps it is only ordinary symbiotes who can't? Was Amounet a queen in the sense of producing larvae, or in the royal sense only?
Given the looks of Shifu, I would go with the kids having symbiote DNA. He didn't look like the human parents, so he must have gotten his looks from somewhere else. Perhaps Apophis has those slanted eyes
nebulan - do draw some hybrid kids - maybe they have red eyes