Ive always wondered why there are no cross breeds, maybe they just cant breed but that wouldn't make much sense as the only thing splitting a Breton from a imperial is hairstyles.

http://www.imperial-library.info/content/notes-racial-phylogeny-and-biology

There are, it is the mother that the offspring will look like. Take the Grand Champion Orc (forgot name) from oblivion: His father was a Imperial vampire and mother was an Orc.

Past games have shown Imperial and Breton courtship and so on (I think oblivion had a Dunmer male, Altmer female couple)

In Shivering Isles, there is a book of about Cilorn that tells of the count impregnating an Argonian female. Correcting me if wrong...

At http://www.uesp.net/wiki/Skyrim:Dragon_Bridge:
Mother =http://www.uesp.net/wiki/Skyrim:Michel_Lylvieve (Breton)
Father = http://www.uesp.net/wiki/Skyrim:Azzada_Lylvieve (Redguard)
Son = http://www.uesp.net/wiki/Skyrim:Clinton_Lylvieve (Breton)

EDIT: Will update if I find more.

Example of what may be half-siblings at the http://www.uesp.net/wiki/Skyrim:The_Winking_Skeeverr:
Father = http://www.uesp.net/wiki/Skyrim:Corpulus_Vinius (Imperial)
Son = http://www.uesp.net/wiki/Skyrim:Sorex_Vinius(Imperial)
Daughter = http://www.uesp.net/wiki/Skyrim:Minette_Vinius (Nord)

Possible mistake by dev's or an example of adoption:
Mother = http://www.uesp.net/wiki/Skyrim:Mena(Breton)
Father = http://www.uesp.net/wiki/Skyrim:Enmon(Breton)
Daughter = http://www.uesp.net/wiki/Skyrim:Fjotra(Nord)

There's also the two Redguards (I think.) in Markarth who has a daughter who looks Nordic. Of course, I'm quick to call that they only bothered with only one character model for the children in Skyrim.

Halfbreeds are all aborted. It's just the way it is and the way it's always been.

What about Jagar Tharn? (Breton/Dunmer)

What about him?

Wait, Jagar has Dunmer in him

When did this happen?!

Oy.

The red eyes. Also, in "The Real Barenziah" Symmachus calls Tharn a mongrel elf.

The Grey Prince was half Imperial (vampire father) and half Orsimer. I think the Mankar Camoran's family line was a mix of Altmer and Bosmer.

I think that beast races shouldn't be able to mix. That would just been plain stupid. I think too much mixing will make having races pointless.

I'm sure throughout our own history race mixing in all cultures was greatly frowned upon until in the modern age of enlightenment. I'm sure it would be a similar thing in TES hence there not being that many mixed marriages. The games has to try and have some grown-up realism about it.

Nobody really cares about mixing races. Reman had Khajiit lovers and nobody cared, so did Barenziah and nobody cared (about the race anyway). One of the Emperors married a Dunmer and the only reason people cared was because she came from Morrowind. They would have cared the same if Morrowind was inhabited by Bretons. The only people that really seem to care are the Dunmer and the Altmer, for the rest from what we've seen it's irrelevant.

I'm sure Ulfric Stormcloak and the many Nords that share his views would beg to differ. I'm sure the Thalmor and their views of being the 'pure' race is another example of Tamriel views. I don't think Imperials and Nords have a problem with each other as Tiber Septim was a Nord after all. I think I read that Nords do seem themselves as purer though. I'm guessing many Imperials will see Nords as barbaric and uncivilised in comparison to themselves.

When the Nords first discovered the Bretons they were going to wipe them out until they heard them speak in a language which was broken Nordic and they realised what and who they are. Bretons are still often treated as lower class citizens by many Imperials and Nords. Look at the way the Forsworn are treated in the Reach. In High Rock they have a caste system. My guess is the more man genes are at the top.

no you are right. They try to keep it as some kid's fantasy realm and try never to have any aspect of realism to it.

Um, nooo. Most (if not all) of the word's population is the product of one migration or another conquest resulting in the mixing of genes and culture.

This.

And also, regardless of what Racial Phylogeny says, I think that racial mixing works the same in TES as it does in real life (Argonians and Sload aside...maybe).

that is why so many made slaves of other races and made them lesser being (and I'm not talking of the more modern Atlantic slave trade). short term and not long term. I think you get my point. Over a period of time we are just one big mix up.

The couple in Dawnstar are expecting (Male Nord, Female Redguard)

Slavery does not preclude interbreeding. http://en.wikipedia.org/wiki/Interracial_marriage provides a good overview of racial mixing throughout history, even if you ignore all the [citation needed].