What's the difference between genotype and phenotype?

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The genotype of an organism is the alleles it has. while the phenotype is the characteristics the alleles produce.

 

For examples the alleles for hair colour could be BB for brown hair and Bb for blonde hair,

The genotype BB would mean the phenotype is a person having brown hair, 

while the genotype Bb makes the phenotype a person with blonde hair.

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