Which of These, If True, Would Support the Claim That

question 63

Multiple Choice

Which of these, if true, would support the claim that the ancestral cnidarians had bilateral symmetry?
1) Cnidarian larvae possess anterior-posterior, left-right, and dorsal-ventral aspects.
2) Cnidarians have fewer Hox genes than bilaterians.
3) All extant cnidarians, including Nematostella, are diploblastic.
4) β-catenin turns out to be essential for gastrulation in all animals in which it occurs.
5) All cnidarians are acoelomate.

• A) 1 only
• B) 1 and 4
• C) 2 and 3
• D) 2 and 4
• E) 4 and 5

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