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What does RR mean in blood type?

Updated: 8/10/2023
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11y ago

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Without any other numbers or letters added yet to indicate the rest of the Rh phenotype, two upper case R's indicate that the person has a double dose (or homozygous) D antigen.

The person is Rh positive with the genotype being DD rather than heterozygous Dd.

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11y ago
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Q: What does RR mean in blood type?
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Can a woman with type a Rh negative blood have a healthy baby with type b Rh positive blood?

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What type of alleles are presented in a homozygous genotype?

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