Early in Development,vertebrate Embryos Develop a Characteristic Series of Pouches

question 13

Multiple Choice

Early in development,vertebrate embryos develop a characteristic series of pouches in the "throat" region;these pouches are called pharyngeal arches.In the early 1800s,an embryologist named Karl Reichert determined that two of the three mammalian inner ear bones (the "hammer" and the "anvil") arose from one of the pharyngeal arches.The same part of the same arch gives rise to the bones that form the jaw joint in reptiles.Which of the following best describes this finding?

• A) This is an example of a fossil intermediate demonstrating how a series of complex traits evolved through time.
• B) This is an example of how genetic similarities and differences can be used to determine how organisms are evolutionarily related.
• C) This is an example of a developmental homology from which we can infer that reptiles and mammals are evolutionarily related.
• D) This is an example of how a vestigial structure-the reptilian jaw joint-can be used to demonstrate that reptiles and mammals are evolutionarily related.
• E) This is an example of how DNA mutations create fossil intermediates.

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