Answers are grounded in this paper and cite their sources.
Recent data published in BMC Biology from the globin gene clusters in platypus, together with data from other species, show that beta-globin genes transposed from one chromosomal location to another. This resolves some controversies about vertebrate globin gene evolution but ignites new ones.
No takes yet. Share an insight, caveat, or question.
Ross C. Hardison (2008) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: