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 the Metazoa. Abbreviations for the cell junctions shown are as follows: Tight Junctions (TJ); belt Adherens Junctions (belt-AJ); spot adherens junctions (spot-AJ), GAP junctions (GJ), Focal Adhesions (FA), Septate Junctions (SI). Based on the diagram, which cell junction(s) were likely present in the common ancestor of all metazoans? Explain your answer. (3 points) a. Which cell junction(s) were likely present in the common ancestor of Bilateral animals (invertebrates and vertebrates)? Explain your answer. (3 points) b. Page 4 of 4

Explanation / Answer

Metazoan ancestor must have possessed, at a minimum, basic cellular connections.Adherens junctions, which physically tether adjacent cells to one another are found in rudimentary form in sponge epithelia.

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