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)
A.
Both parents have blue eyes
B.
Their father has blue eyes and their mother has brown eyes
C.
both parents have brown eyes
D.
Their mother has the blue eyes and their father has the brown eyes
A man who has the trait for colour blindness marries a normal woman. What percentage of their children would be sufferers, carriers and normal respectively
