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What determines whether an allele is dominant or recessive

User Dhh
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Answer:

A dominant allele in the genotype is always expressed in the phenotype. For example, if brown eye color is dominant in a species, an animal that inherits even a single brown allele will always have brown eyes. If it's recessive, he'll only have brown eyes if he inherits a brown allele from each parent.

Step-by-step explanation:

User Barbora
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