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A. Explain which force of evolution is seen here by a hybrid bird landing on an island that is not its home and breeding with the indigenous population.  B. Explain which force of evolution randomly chooses an individual from a larger gene pool to form a new, smaller population with less genetic variety

A. Explain which force of evolution is seen here by a hybrid bird landing on an island that is not its home and breeding with the indigenous population.  B. Explain which force of evolution randomly chooses an individual from a larger gene pool to form a new, smaller population with less genetic variety

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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A. Explain which force of evolution is seen here by a hybrid bird landing on an island that is not its home and breeding with the indigenous population.  B. Explain which force of evolution randomly chooses an individual from a larger gene pool to form a new, smaller population with less genetic variety. 
Tale of Speciation on Daphne Major "Speciation, the process by which two species form from one, involves the development of reproductive isolation of two divergent lineages."" 11 https://www.youtube.com/watch?v=MCM23M-CCog&t=17s This is an interesting tale of a small population, an immigrant, incest, and isolation. Good thing these are birds. In 1981 a population of finches of the species Geospiza fortis lived on the Galapagos island of Daphne Major. An immigrant landed on the island. It was a hybrid of two finch species from another island. It's genetic make up was 66% Geospiza fortis and 34% Geospiza scandens (another common Galapagos finch species). It came from an unknown island, was unusually large, had a huge beak, and sang a strange song. Over four generations this hybrid bred with other G. fortis finches on the island until a drought occurred, wiping out all but one brother and sister. The brother and sister had no choice but to breed with each other (scandal!). Their offspring were different from either of them or other finches on the island. The male's song was strange because in learning the song from the father, it was copied incorrectly. But, females of this new population understood the song even though it was wrong. Members of the greater G. fortis population ignored the incorrect song and would not mate with the males who sang it. A barrier was in place that originally resulted from one immigrant being separated from its own population somewhere else, and its lineage ended up being behaviorally isolated by an incorrect learned behavior.
Transcribed Image Text:Tale of Speciation on Daphne Major "Speciation, the process by which two species form from one, involves the development of reproductive isolation of two divergent lineages."" 11 https://www.youtube.com/watch?v=MCM23M-CCog&t=17s This is an interesting tale of a small population, an immigrant, incest, and isolation. Good thing these are birds. In 1981 a population of finches of the species Geospiza fortis lived on the Galapagos island of Daphne Major. An immigrant landed on the island. It was a hybrid of two finch species from another island. It's genetic make up was 66% Geospiza fortis and 34% Geospiza scandens (another common Galapagos finch species). It came from an unknown island, was unusually large, had a huge beak, and sang a strange song. Over four generations this hybrid bred with other G. fortis finches on the island until a drought occurred, wiping out all but one brother and sister. The brother and sister had no choice but to breed with each other (scandal!). Their offspring were different from either of them or other finches on the island. The male's song was strange because in learning the song from the father, it was copied incorrectly. But, females of this new population understood the song even though it was wrong. Members of the greater G. fortis population ignored the incorrect song and would not mate with the males who sang it. A barrier was in place that originally resulted from one immigrant being separated from its own population somewhere else, and its lineage ended up being behaviorally isolated by an incorrect learned behavior.
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