Amphioxus is a key organism for understanding evolution of the vertebrate genome. Scientists have discovered that each amphioxus gene correlates to either two or three vertebrate counterparts. Since amphioxus are in Phylum Cephalochordata and vertebrates, Phylum Chordata, I believe scientists are trying to link a connection between the two phlya. It seems that vertebrates could have evolved from cephalochordates by two successive rounds of whole-genome replication.
Source:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1461312/
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