Humans, mice, rats, chickens, and all other bony vertebrates have two groups of a developmental gene.The most likely explanation is that these two groups of genes arose from a gene duplication event in the common ancestor of

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The presence of the two groups of genes in all bony vertebrates suggests that the gene duplication event occurred in the common ancestor of all bony vertebrates, rather than in a more recent common ancestor of only some of these species.

Humans, Mice, Rats, Chickens, and All Other Bony Vertebrates Have