Suppose That There Are Three Species That Are Closely Related

Suppose that there are three species that are closely related as indicated by the phylogenetic tree below. Each species contains only one copy of a particular gene. The version in Species A is designated Gene_A, and so on. The relationships among the three versions of the gene in the different species are shown below. Explain in terms of duplications and/or deletions the incongruity between the phylogenetic (species) tree and the gene tree.