In the gene locus for eye colour in humans, the allele for brown eye is dominant over the allele for blue eyes. If a homozygous brown-eyed girl has a brother with blue eyes, what are the likely phenotypes of there parents’eye colour (Eye colour is not a sex linked trait)
- Both parents have blue eyes
- Their father has blue eyes and their mother has brown eyes
-
both parents have brown eyes
- Their mother has the blue eyes and their father has the brown eyes