Following a gene duplication, the two genes will accumulate different mutations, causing them to have slightly different sequences. In Figure 8.7, which pair of genes would you expect to have more similar sequences: α1 and α2 or ψα1 and α2? Explain your answer.

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Millions of years ago 200- Mb 12 YG YA chains 400- Primordial myoglobin Primordial hemoglobin 600- 800- Ancestral globin B chains 1000- FIGURE 8.7 The evolution of the globin gene family in humans. The globin gene family evolved from a single ancestral globin gene. The first gene duplication produced two genes, one that encodes myoglobin (on chromosome 22) and a primordial hemoglobin gene that duplicated several times to produce several a-chain and -chain genes, which are found on chromosomes 16 and 11, respectively. The four genes shown in gray are nonfunctional pseudogenes.