Hey folks, so some things happened and reveals took place on the server, which inevitably leads to me researching a certain topic concerning the Forgotten Realms... Once again...
This time it's dragons, I have a few questions I would like to learn about them, if anyone can answer them I will greatly appreciate it, as always.
Starting simple:
This? This is my jam.
As Arya said, the type of Dragon Disciple that results is not tied to alignment like an outsider but to bloodline. If you had an evil ancestor who dallied around with chromatic dragons, that taint rests in your heritage regardless of what your personal alignment is. Likewise, as Arya said, certain kinds of bloodlines are going to be more attractive to certain individuals. Certain good characters wouldn't want to mar themselves with the power granted by evil draconic ancestry, fearful it might tempt them into actions they would otherwise deplore. Others might be willing to take the consequences of any such action for the strength they need to do good things - protect others, stop evil, and otherwise make a difference - and might be willing to scorn their own physical appearance and bloodline by drawing out that ancient power, whatever the consequences. It really depends on the character, the circumstances, and the reasonings.
Again, seconding Arya. Dragons are born by species, not by alignment - an evil gold dragon fathers/mothers baby gold dragons. EXCEPT in cases of cross-species interbreeding.
There's a chart in Draconomicon (I believe) and a similar one produced by Paizo for Pathfinder regarding the effects of two different species of dragons interbreeding. Basically, what it says is the dragon type that is born between two dragons of differing colors is dependent on how powerful the two species are in respect to one another. Red Dragons are the mightiest of the Chromatics; a Red Dragon (father OR mother) breeding with any other kind of chromatic will produce Red offspring. White Dragons, being the lowliest of the chromatics, can only produce more White Dragons by breeding with White Dragons; any other species will produce dragons of the other color. Likewise for the metallics, with Gold at the top and I believe Bronze at the bottom (correct me if I'm wrong, since I'm AFB I can't look it up right this moment; if it's not Bronze it's Copper).
I believe the official listing is Red > Blue > Black > Green > White for chromatics, and Gold > Silver > Brass > Copper/Bronze > Bronze/Copper for metallics.
It gets a bit weirder if you try to consider metallic-chromatic crossbreeding, or bring in the various other types of dragons - the gemstone dragons, the untyped dragons like prismatics and shadows, the planar dragons, and so forth. At that point I would have to just say it's the GM's/setting maker's call. So in this case, Vincent and FW.
Beyond that, for the blunt answer, yes. Dragons are oviparous - they lay eggs. Typical clutches are three to seven eggs, varying up or down based on dragon type.
So that settles that, but we're not quite done, but I'll get into the next below, since it touches on your next question....
In addition to what was already stated about dragons' high intellectual capacity even at extremely young ages, Draconomicon suggests that dragons have a sort of rudimentary racial memory. When a wyrmling dragon is in the egg, its growing mind is nourished by not only the nutrients in the egg but a sort of dream-memory inherited from its parents, their parents, and so on and so forth back generations upon generations. What this means, in short, is that a dragon is born
knowing that being (insert alignment of dragon type here) IS a successful prospect. After all, its parents, and their parents, and their parents, all the way back to time immemorial, were all (generally) of X alignment. It got the Cliff's Notes version of their lives, and saw them live, grow, triumph, and mate and pass something of themselves on to the next generation countless times over. That, among many other things, imprints a very strong mental connection between "species's standard alignment" and "successfully live, thrive, and mate".
This is why it's a very, very, VERY big deal when a (true) dragon changes alignment: that is basically that dragon looking at lives upon lives upon lives - DRAGON lives, in all their immense length - and deciding, against millennia of evidence to the contrary, that no, this was not the right idea.
Arya pretty much has this one covered: they become a Half-Dragon, not a full dragon, of the type their bloodline and ancestry is tied to; in the case of your example, a Copper Half-Dragon.
To add to this, there are extremely few examples, in any setting, of humanoids becoming dragons for long-term periods beyond basic polymorph effects. Most, like Faerun's Devil Dragon, were bonkers insane to begin with. The other exceptions are typically, again, already long-lived creatures who don't flinch quite as much at the prospect of a dragon's extended lifespan, elves or similar entities. I can't think of any examples, in any media, of a human or other short-lived race becoming a dragon if they aren't 1.) a powerful wizard who was functionally immortal anyway; 2.) just using a short-term effect like a polymorph spell, or hit with a Curse effect or something of that like; or 3.) already are or shortly become insane (such as the Norse legend of Fafnir, where a dwarf becomes so mad with greed driven by a cursed treasure that he becomes a dragon to guard it).
Yes and no.
The physical traits of a Dragon Disciple tend to be less pronounced. Compare the Dragon Disciple in the 3.5 DMG with the Half-Dragon in the Monster Manual. The Half-Dragon has green-black scaly skin, a visibly-draconic face with a slight muzzle, big ol' black dragon horns, jagged teeth, big reptilian hands and feet, and so forth. The Dragon Disciple has wings, some scales on her arms, claws on her hands and feet, and... that's really it. There's some variance for character design, of course - CD characters like to add horns, thanks to the horns widget, even on DDs - but most still don't go to the extent of the MM Half-Dragon's appearance. Heck, most of our actual applied-for Half-Dragons don't look that much like the MM one, I think only Khorigesh takes it that far.
However, mechanically, they ARE Half-Dragons, full stop. They have all the normal immunities of a Half-Dragon (sleep, paralysis, the element of their breath weapon, effects that target humanoids). They have the same ability score adjustments, natural armor, special abilities, etc., just spread out over ten levels. Their type changes to Dragon. Etc. etc. etc.
All in all, the confusion over the class being called RED Dragon Disciple but CD wanting to offer DDs of other types and other heritages was what led to the class name being changed (back) to just Dragon Disciple in the first place. NWN called it RDD because, in the original game, red dragon wings and firey breath were the only option available; CD and the haks we took the content from has been generous enough to provide mechanics to allow other colors, other immunities, and other attack elements.