Ok, everyone that paid attention to DBZ understands that humans and saiyans can reproduce and when they do, a half-human/half-saiyan is born. In DBGT(non-canonical) and DB: A Hero's Legacy(also non-canonical), we see the Saiyan bloodline extremely diluted.

My question is, why is only the saiyan blood diluted when a human and saiyan reproduce. Based on the basic crossbreeding laws, the full blooded saiyan and the full blooded human will always produce a half-saiyan/half-human. However if a half-human/half-saiyan breeds with a half-human/half-saiyan, there's a 50/50 shot at reproducing another half-saiyan/half-human.

So, my question is, if they were to continue to reproduce, wouldn't it be the human blood that eventually diluted itself out and the saiyan blood become pure once again? Thus leading to the reemergence of the saiyan race? Or am I just too ignorant about crossbreeding?

  • your right about how breeding works, the reason we see the sayian blood breading out though is because a halfsayan/halfhuman breading with a full human (an example of this is Pan from GT) they are only 1/4th sayian now, and pans kids when she breads with a full human will be 1/8th sayian which is why the dilution happens, the halfblood sayians arnt marrying each other their marrying other humans diluting the sayian genes out of them. – Himarm Nov 5 '14 at 20:11
  • also when you mix a hybred with a hybred you get 1 out of 4 pure blood sayian, 1 out of 4 pure human, 2 out of 4 half blood. so on average hybreds marrying hybreds would just keep hybreds around, with a few scattered full blood sayians and a few scattered normal humans, however this is genetics at the most basic levels, when talking about cross specie genetics like this their millions of variables and relationships to take into account for the purity of each childs blood. – Himarm Nov 5 '14 at 20:16
  • But, say if Goten and Bra began mating and reproducing, in theory, wouldn't they be able to restart the full blooded Saiyan race? – Robert Nov 5 '14 at 20:24
  • they could, but it would involve inbreading, starting a species from 2 people involves mom + son, dad + daughter, niece plus uncle ect. since we only have 2 purebloods, vegita and goku. – Himarm Nov 5 '14 at 20:27
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    Whoever voted to close, questions based on incorrect premises/theories should be downvoted, not closed – phantom42 Nov 5 '14 at 21:00

That's not how breeding works, Himarm and Robert; that's how some genes work. In situations of breeding between different types of things, the child is treated as the average of the parents; I.E. the child of a Native American and a European is considered half European/ half Native American, then if this resultant child later bred with a European it'd be 1/4 Native American, 3/4 European. I give this example because this train of thought is the same which led to the use of Blood Quantum Levels in the past in the U.S.

A half- can never produce a full-blooded individual, and thus each generation can only get closer (by half of what remains) to full-blooded. In the case of the Saiyans, being as there are only five full-blooded members and no full-blooded females, they can not rise again without cloning or other futuristic technologies.

  • So again, if two half breeds begin reproducing, the only thing they'll reproduce is a half-breed? – Robert Nov 5 '14 at 20:53
  • this is wrong, since goku could have a child with a daughter of his, that child would be 3/4 sayian, then that child and goku could have another child which would be even more pure. eventually youd run into a situation where they are 99.9999% pure, essentially a new pureblood. – Himarm Nov 5 '14 at 20:55
  • but again, the genetics of 2 different species is alot harder to actually determine. – Himarm Nov 5 '14 at 20:57
  • Bingo, Robert. And that's still not pure, Himarm. Incidentally, most Native Tribes use jus sanguinis now. – user40790 Nov 5 '14 at 21:02
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    @GorchestopherH DNA has a finite number of genes, so it's impossible to get continually asymptotically closer - it would happen long before "forever". – Izkata Nov 6 '14 at 0:00

I am sure that there are many more descendants of Kakarot and Vegeta that are never mentioned in either the manga and anime such as the unknown ancestors of Goku jr. The saiyans will reemerge but I am sure that they hide in plain sight practicing their ways behind closed doors waiting to find a home planet once more.

  • Um, no, it's explicitly said that Goku, Vegeta, Nappa, and Raditz are the only remaining Saiyans. – Robert Mar 30 '16 at 17:37
  • Well of the five which lived, one Bardock is all but unknown to the z-fighters and the other saiyans survivors. There may well be more survivors that are roaming the galaxies. – Callum McDonald Mar 31 '16 at 10:01
  • There were only four survivors, Bardock didn't survive. The whole sending him back in time thing to make him the Legendary Super Saiyan is not canon, it's a response to the fan reaction to the character of Bardock. Likewise, Broly and Pegasus aren't canon either, neither is Vegeta's little brother. – Robert Mar 31 '16 at 11:41
  • Canonically, there are four surviving Saiyans, Goku, Vegeta, Nappa, and Raditz. – Robert Mar 31 '16 at 11:41
  • The use all sources of information rather than using just one broadens the picture and creates a more vibrant tapestry for us the viewer to marvel at. – Callum McDonald Mar 31 '16 at 15:21

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