Even though a female may have the gene for blue eyes in her chromosomes, it is possible that she may actually have brown eyes because this particular characteristic is recessive. Instances like these most clearly demonstrate the distinction between

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The distinction between phenotype and genotype is demonstrated here. Phenotype refers to the observable characteristics (in this case, brown eyes), while genotype refers to the genetic makeup (having the gene for blue eyes but it being recessive).

Even Though a Female May Have the Gene for Blue