Unfortunately it seems to be a pretty common occurrance in manga to have a "half Japanses with blonde hair and blue eyes. This is extremely irritating due to the genetic inability of that scenario. A half would not have blue eyes, but rather brown/black that are the dominant trait held by both sides of the genome of the Japanese parent. Blue eyes are recessive, so they would be over-ridden by the dominant brown gene. This is also the same for the pure blonde hair that she has. IT WOULD NEVER HAPPEN. Even with the numerous genes that combine for hair color, pure blond not only is impossible, but so is anything lighter than a dark brown. (I do acknowledge the polygene sets allowing for the blonde gene to lighten black hair to a dark brown)
The only way she could have blonde hair would be in early childhood during the common expression of the blonde gene in a (blonde/(brown or black)) pairing. But by her age, it is 100% impossible for her as a half Japanese to have natural pure blonde hair.
For blue eyes I will admit there is a slight possiblity , but that depends on a drifting of the blue eye gene from main land china to japan, where it occasionaly surfaces without european blood due to inheritance from an ancestor who came to asia thousands of years ago who mutated that gene. It could survive still showning the dominant brown gene, and end up in her mother who would have brown eyes, but with her father who has blue eyes or brown eyes with the soame (blue/brown gene) pair. Either way at most with these conditions fufuilled, ther is a 50%-25% chance of her having blue eyes, and that is AFTER winning lottery like odds to get that gene in the first place on her mothers side. STILL Whenever the blue eyed gene would show itself in asia (blue/blue), it was common considered of supernatural(sorcery) indication and the posessor was killed, eliminating a double holder of that gene not of european blood. That means those lottery like odds are even worse due to elimination of gentic carriers/expressors.
No matter what though, IT IS GENETICALLY IMPOSSIBLE FOR HER TO BE A NATURAL BLONDE AT HER AGE
ASIAN+ (adult) BLONDE DOES NOT EVER = (adult) BLONDE. EVER.
** the adult tag is also meant to include puberty and up years.
I really dislike this tedndency by manga authors (If you can't tell)
Edited by Gentleman, 03 April 2012 - 01:10 AM.