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Homologous and Vestigial Structures.

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Brena Young

on 21 May 2014

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Transcript of Homologous and Vestigial Structures.

Vestigial Structures

What are homologous and vestigial structures?
How do these structures arise?
How are Homologous and Vestigial Structures different?
Homologous and Vestigial Structures
Homology is the existence of shared ancestry between a pair of structures, or genes, in different species.
A vestigial structure is the structure in an organism that has lost all or most of its original function in the course of evolution.
A homologous structure arises by...
Homologous structures arise from common ancestry within a population of species.
A vestigial structure arises by...
Vestigial structures are often homologous to structures that are functioning normally in other species. Therefore, vestigial structures can be considered evidence for evolution, the process by which beneficial heritable traits arise in populations over an extended period of time.
Examples of Homologous Structure.
- Bat wings
- Whale fins
- Human arm
- Leg of a dog
Examples of a Vestigial Structure
- Human's coccyx or tail bone
- Whale legs
- Ostrich's wings
- Appendix
Homologous structure has a similarity in the body part's formation, compared to other species' comparative parts.
Vestigial Structure
Vestigial structure is the degeneration or underdevelopment of body parts (no longer useful), when compared to past ancestral species' body parts.
By: Mansi Patel, Hope Kowalski, and Brena Young
How does this support the theory of evolution?
Homologous Structure
Homologous structure took the back up of evidence from DNA to reaffirm the evolutionary relatedness of species with homologous structure.

Homologous structure is strong evidence that species today share similar traits to other (past or present) species. Which, indicates that we all evolved from the same ancestor.
The existence of vestigial structure is one of the most cited evidences for human evolution.

Vestigial organs can be explained in terms of changes in the environment and a specie's way of life.
Body parts similar in structure to other species' comparative parts are known as homologous structures.
Body parts that are smaller and simpler in structure, than corresponding parts in the ancestral species, are called vestigial structures.
1) darwinwasright.org
2) evolution.about.com
3) evolution.about.com

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