Question

Cardueline finches can be found in many areas of the world, including North America and Asia. Hawaiian honeycreepers, which are found only in Hawaii, have been found to have DNA commonalities with this group of finches that indicate they have a common ancestor. Which mechanism might have led to the appearance of the Hawaiian honeycreeper?

Answer 1

Geographical Isolation is the mechanism that might have led to the appearance of the Hawaiian honeycreeper.

Geographical Isolation is the term used that refers to a population of animals, plants, or other organisms that are separated and unable to exchange genetic materials with other organism of the same species.

Geographical Isolation may be a result of coincidence or accident.

Here are some factors of Geographical Isolation:
1) Isolation by barriers 
2) Isolation by distance
3) Isolation after an Event
4) Isolation by separation

Answer 2

Cardueline finches can be found in many areas of the world, including North America and Asia. Hawaiian honeycreepers, which are found only in Hawaii, has been found to have DNA commonalities with this group of finches that indicate they have a common ancestor. Geographical isolation might have led to the appearance of the Hawaiian honeycreeper.

Further Explanation:

Geographical Isolation is the term or mechanism which is used in a population of plant, animals, or other different organisms that are separated to each other and not able to exchange the genetic materials or information with other organism of the similar species. Either accident or coincidence can lead to geographical isolation. There some factor that responsible for geographical isolation.

• Isolation due to barriers
• Sudden drift in environmental condition
• Isolation due to distance
• Isolation due to separation

Cardueline finches are found in several different areas but the Hawaiian honeycreepers are solely present in Hawaiian. This suggest that the Hawaiian creepers were separated from cardueline finches and successive mutations as well as intra-breeding among the isolated population only gave rise to the condition mention above. This implies that both these species had ones lived together and thus the similarities in DNA is observed.

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Answer Details:

Grade: High School  

Subject: Biology

Chapter: Ecology

Keywords:

Cardueline finches, Hawaiian creepers, DNA, species, isolation, geographical isolation, drift, genetic information, separation, distance, environmental condition, mutation.