erastus25 said:
They kinda did that with Tora Ziyal. It was Cardie/Bajoran, granted, but the same principle was at work.
As for the "difficulty" and need for extra help, who's to say that in the 24th Century it is necessarily that hard? For all we know they just need to take a few pills and it will work. I mean, think about medicine in 1657, compared to today. A similar growth could occur over the next 350 years.
A Bajoran Cardassian mix might be very possible. Remember, Bajorans visited Cardassia long before Cardassia had space flight technology. It's conceivable that the Bajorans who crashed on Cardassia were able to find a means of creating hybrids. Once Bajoran genes entered the Cardassian gene pool, it could become possible without any further outside assistance.
Tom and B'Lana child though is something else. From what we've seen of the 2 Klingon/Human mixes and the Klingon/half human half klingon mix is that the Klingon genes are dominant. So despite Tom being 100% human (as far as we know) the Klingon genes would still be dominant.