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How can a sister with the same parents have different hair colors?
Wiki User
∙ 15y ago
Yes, this is possible. The parents may not have the same hair color as their offspring, because the offspring could have the hair color caused by a recessive allele. This allele could have been present in an ancestor, but not shown up again because its frequency is not as common as another hair color
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoBlack hair is dominant to blond. The Black haired brother either got to dominant alleles (ex. BB) or dominant and Recessive allele (ex. Bb). The Blond haired brother had to have two recessive alleles (ex. bb) This means the parents are both heterozygous meaning they have a recessive and dominant allele (Bb)
or the brothers could be half brothers.
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