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Explain how the allele for sickle cell disease, which is a harmful allele when a person is homozygous, can be beneficial when a person is heterozygous.
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Explain how the allele for sickle cell disease, which is a harmful allele when a person is homozygous, can be beneficial when a person is heterozygous.

User Christophmccann
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Since sickle cell is a recessive trait, having a capital letter can make someone have a chance of just being a carrier of the gene.
User Rachel Shallit
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