The developmental genes bicoid and zen are two distinct genes, with different functions, that were derived from a relatively old gene duplication.They are thus

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Bicoid and zen are paralogs, which means that they are homologous genes that arise from a gene duplication event and diverged in function over time. Orthologs are genes found in different species that have evolved from a common ancestor, whereas convergent evolution refers to the process by which different species evolve similar traits independently. Finally, concerted evolution refers to the process by which multiple genes evolve in concert with each other, maintaining similar nucleotide sequences despite being located on different chromosomes.

The Developmental Genes Bicoid and Zen Are Two Distinct Genes