Figure 27.29. Gene duplications during the evolution of the human globin gene families. The initial split gave rise to two lineages, one leading to the modern gene for myoglobin and the other to the globin genes. Subsequently, the proto-α-globin and proto-β-globin lineages split following a duplication. Other duplications took place within the α and β lineages. (Modified from Strachan T. and Read A.P. Human Molecular Genetics 2, Fig. 14.16, © 1999 Garland Science.)
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