A swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolution of the swim bladder from the air-breathing organ (a simple lung) of an ancestral fish is an example of
a. Exaptation.
b. Changes in Hox gene expression.
c. Paedomorphosis.
d. Adaptive radiation.

검증된 단계별 안내

Understand the concept of exaptation: Exaptation refers to a trait that has been co-opted for a use other than the one for which natural selection has built it. In this context, the swim bladder evolved from an air-breathing organ, which is an example of exaptation.

Consider the role of Hox genes: Hox genes are involved in the regulation of patterns of anatomical development (morphogenesis) in animals. Changes in Hox gene expression can lead to significant evolutionary changes, but this is not directly related to the evolution of the swim bladder.

Define paedomorphosis: Paedomorphosis is the retention of juvenile features in the adult organism. This concept does not apply to the evolution of the swim bladder from an air-breathing organ.

Understand adaptive radiation: Adaptive radiation is the process by which organisms diversify rapidly into a multitude of new forms, particularly when a change in the environment makes new resources available. This is not directly related to the evolution of the swim bladder.

Identify the correct answer: Based on the definitions and explanations, the evolution of the swim bladder from an air-breathing organ is best described as an example of exaptation.

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주요 개념

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Exaptation

Exaptation refers to a trait that has been co-opted for a use other than the one for which natural selection has built it. In the context of the swim bladder, it originally evolved as an air-breathing organ (a simple lung) in ancestral fish and later adapted to help with buoyancy. This illustrates how structures can evolve new functions over time.

Hox Gene Expression

Hox genes are a group of related genes that control the body plan of an embryo along the head-tail axis. Changes in Hox gene expression can lead to significant evolutionary transformations by altering the development of structures. However, in the case of the swim bladder, the focus is on functional adaptation rather than developmental changes driven by Hox genes.

Adaptive Radiation

Adaptive radiation is the process by which organisms diversify rapidly into a multitude of new forms, particularly when a change in the environment makes new resources available. While adaptive radiation explains the diversification of species, the evolution of the swim bladder is more about the modification of an existing structure for a new function, rather than the rapid emergence of new species.