I was studying for a genetics test and playing ck2, well I'm playing Ghiscari empire when I bought a female valyrian slave, long story short freed (didn't feel right to keep a lover a slave) and married her after my character fell in love. So fast-forward 10 years later and 6 kids I noticed that out of all the kids 5, are valyrian, and 1 is my ethnicity. So it got me to wondering it seems that the valyrian genetics are dominant over ghis. Going by some of the characters in the tv show it also seems so there.