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Originally Posted by etburyan  1. Do Targaryens have strong genetics. It seems that their hair and such is pretty defining
2. Jon is only described as looking like a stark
3. If Stark genes were strong, then why did Ned's children look like Cat? |
Let me try explaining this. Martin's genetics rules are pretty much same as in real world. Remember Robert's bastards? Well in our world black hair is stronger than blue hair (actually black is the strongest haircolor in real world).
Targaryens were mating between themselves to keep their genetics (indigo and purple eyes are pretty rare irc) clean, I mean when u mate silver-haired purple eyed male with golden hair female with blue eyes, posibility to get black haired ofspring is 0.
Now when u mate silver haired purple eyed male (Rhaegar) with blackhaired black eyed female chances to get silverhaired offspring are pretty much 0. (except if one of females ancestors had blue hair and female has hidden gene for it)