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

question 25

Multiple Choice

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

-What conclusion is apparent from the data in Table 32.1?

• 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 7 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 7 Hox genes.

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Definitions:

Incremental Change

Gradual adjustments or improvements made over time to processes, strategies, or products, rather than major transformations or innovations.

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Deejay

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