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

question 58

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 the number of Hox genes from the last common ancestor of insects and vertebrates to ancestral vertebrates, as shown in the table?

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

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Definitions:

Equivalent Units

A concept used in cost accounting to convert partially completed goods into a number of equivalent completed units for inventory valuation.

Forming Department

A specific department in manufacturing where raw materials begin their transformation into final products through various processes.

Weighted-Average Method

An inventory costing method that assigns costs based on the average cost of all units available during the period.

Equivalent Units

A concept used in cost accounting to convert partially completed goods into the equivalent of full units of output, facilitating consistency in financial reporting and analysis.