Table 271Proposed Number of Hox Genes in Various Extant and Extinct

question 68

Multiple Choice

Table 27.1.Proposed Number of Hox Genes in Various Extant and Extinct Animals
-What conclusion is apparent from the data in Table 27.1?

• 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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