Strong correlation of F-reticulocyte levels within sib pairs with sickle cell (SS) anemia suggests that the wide-ranging levels found in the SS population are governed by genes linked to the beta S-site. Correlations between F-cell levels in parents and F-reticulocyte levels in their children indicates that these same genes regulate F-cell production in nonanemic persons. Comparison of outcrossed and inbred SS populations suggests that relative well-being arises from homozygosity for alleles dictating high F-reticulocyte response to anemia.
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Dover et al. (1981) studied this question.
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