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

question 74

Multiple Choice

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

-All things being equal, which of these is the most parsimonious explanation for the change in number of Hox genes from the last common ancestor of insects and vertebrates to ancestral vertebrates, as shown in Table 32.1?

• A)The occurrence of 7 independent duplications of individual Hox genes.
• B)The occurrence of 2 distinct duplications of the entire 7-gene cluster, followed by the loss of one cluster.
• C)The occurrence of a single duplication of the entire 7-gene cluster.

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Definitions:

Carrying Costs

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Roller Skates

Wheeled footwear designed for rolling along surfaces, offering a mode of transportation or recreational activity.

Effective Annual Interest Rate

The real rate of interest earned on an investment or paid on a loan over one year, taking into account the effect of compounding.