Table 321 Proposed Number of Hox Genes in Various Extant and and Extinct

question 18

Multiple Choice

Table 32.1. Proposed Number of Hox Genes in Various Extant and Extinct Animals

-What conclusion is apparent from the data in the table?

• A) Land animals have more Hox genes than do those that live in water.
• B) All bilaterian phyla have had the same degree of expansion in their numbers of Hox genes.
• C) Acoel flatworms should be expected to contain seven Hox genes.
• D) The expansion in number of Hox genes throughout vertebrate evolution cannot be explained merely by three duplications of the ancestral vertebrate Hox cluster.
• E) Extant insects all have seven Hox genes.

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