Most models of eye inheritance postulate that there are 3 genes involved
in eye color determination and that brown eyes are dominant while blue eyes
are recessive so that if one has an allele (a version of a gene ) that
determines brown eyes that person
will have brown eyes. To have blue eyes you must have two blue eye alleles.
It is possible for 2 brown eyed people (both carrying the recessive blue
eye allele) to have blue-eyed children. In fact it is not rare. It is
also possible for blue eyed alleles to be carried for several generations
without having blue eyed people until 2 people with blue eyed alleles
marry. It is not thought that eye color affects vision unless
one has no eye pigmentation such as albinos in which case they do have
visual problems.
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