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HESI Biology - Blogs Sample Questions

Both squid and humans have similar eyes, with the exception of the relationship between the optic nerves and the retina being different in both. Apparently, eyes were not present in their last common ancestor. Eyes in squid and humans are known as which of the following types of characteristics?

Correct Answer:
convergent.
the correct answer to the question about the similarity in eye structure between squid and humans is "convergent."

convergent evolution is a fundamental concept in evolutionary biology where different organisms independently evolve similar traits or features. this phenomenon typically occurs when different species face similar environmental challenges and selective pressures, leading them to develop analogous adaptations, even though they are not closely related genetically. the similar traits evolved are known as "analogous structures."

in the case of squid and human eyes, the similarity arises not because of a shared ancestry with modern "camera" eyes (the complex, image-forming eyes that both species possess), but rather as a parallel solution to the problem of vision. the last common ancestor of squid (which are cephalopods) and humans (which are mammals) did not have these complex eyes. therefore, each lineage independently evolved these structures to meet similar ecological needs (e.g., predation, navigation), making this a classic example of convergent evolution.

it's important to differentiate between homologous and analogous traits in evolutionary studies. homologous traits are those inherited from a common ancestor, even if these traits might have undergone some evolutionary changes. in contrast, analogous traits, like the eyes of humans and squid, appear similar not due to shared ancestry but due to convergent evolution. both types of traits can provide insights into the ways organisms adapt to their environments, but they tell different stories about the history of life on earth.

thus, when asked about the type of characteristic that describes the similarities between human and squid eyes, the correct answer is "convergent." these eyes are examples of convergent evolution, where similar environmental pressures have led to the development of similar solutions in different evolutionary lineages.

Additional Blogs for HESI - Health Education Systems, Inc dfgdfgdfg

In your journey to get HESI Biology certified it is important for you to have all information related to your exam. So we have pulled together a list of additional blogs that may be of interest to you because that are all related to the Health Education Systems, Inc.

Exam Edge Blogs for HESI - Health Education Systems, Inc