Fig. 2.

Amino acid polymorphism in the α-globin gene duplicates, HBA-T1 and HBA-T2 (A), and the β-globin gene duplicates, HBB-T1 and HBB-T2 (B), in highland and lowland deer mice. Frequencies (f) of the various protein alleles in each gene × population (high-/low-altitude) combination are shown in the rightmost columns. In panel A, the shaded alleles harbor gene conversion tracts derived from a third α-like globin gene, HBA-T3. Products of these converted alleles do not appear to be incorporated into functional Hb tetramers (see text for details).