15. Shown below is a diagram indicating the phylogenetic distribution of differe

Question

15. Shown below is a diagram indicating the phylogenetic distribution of different types of cell junctions across t Metazoa. Abbreviations for the cell junctions shown are as follows: Tight Junctions (TJ); belt Adherens Junction (belt-AJ); spot adherens junctions (spot-AJ), GAP junctions (GI), Focal Adhesions (FA), Septate Junctions Based on the diagram, which cell junction(s) were likely present in the common ancestor of all metazoans? Explain your answer. (3 points) a. Cridaria invertebrates vertebrates poriteransctenophores anthozoans medusazoans Which celljunction's) were likely present in the common ancestor of Bilateral animals (invertebrates and vertebrates)? Explain your answer. (3 points) b.

Explanation / Answer

Answer a) Poriferans

Explain: Porifera are the phylogenetically oldest metazoan phylum still extant today; they share the closest relationship with the hypothetical common met the loan ancestor.

Answer b) Anthozoans and medusozoans

which is the same with the vertebrates and Invertebrates.

Explain: this system in cnidarians is drastically different from those in bilaterians. it is premature to homologize the cnidarian directive axis with the D-V axis of bilaterians.

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