I dunno. Are good genetics exactly equivalent to physical appearance?
What if that absolutely drop-dead gorgeous blonde is a hemophiliac (i.e. quite likely to die in child-birth without major medical intervention)?
What if she's color-blind to boot (hint: your sons are guaranteed to be colorblind, and vulnerable driving in locales with eccentric/horizontal-positioning approaches to stoplight placement)?
What if she is... er... "blonde"? Is it better genetics to be beautiful than intelligent? Beautiful than resistant (to diseases)?
Intelligence or lack thereof is not correlated to being naturally blonde but lack of intelligence is correlated to being a bleached blonde.