Give an example of a structure that is present in both human and fish embryos, but develops into different structures in each by birth.
Understand the Problem
The question is asking for an example of a structure that is present in human and fish embryos but develops differently in each by birth. This relates to the field of comparative embryology and developmental biology, exploring homologous structures and their divergent fates.
Answer
Pharyngeal arches develop into gills in fish and ears/jaw in humans.
Pharyngeal arches, or gill arches, are present in both human and fish embryos. In fish, these develop into parts of the gills. In humans, these arches develop into parts of the ears and jaw.
Answer for screen readers
Pharyngeal arches, or gill arches, are present in both human and fish embryos. In fish, these develop into parts of the gills. In humans, these arches develop into parts of the ears and jaw.
More Information
The presence of similar structures during embryonic development in different species indicates a shared ancestry. These structures are known as homologous structures.
Tips
A common mistake is to think that humans develop gills. The pharyngeal arches are only present in the embryonic stage and develop into different structures.
Sources
- Evidence of evolution: Embryology - Khan Academy - khanacademy.org
- Give an example of a structure that is present in both human and fish ... - ck12.org
- [PDF] Human embryonic gills and gill slits—down but not out - CiteSeerX - citeseerx.ist.psu.edu
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