A. In terms of the barriers in place that keep species separate, explain whether song recognition is a prezygotic barrier or a post-zygotic barrier. B. Explain which type of isolating mechanism this wouldbe once you determine the barrier type. C. Discuss why song would be a barrier to mating with another species and having the incorrect song might change your fitness potential. Song DifferencesThere are two main reasons why Geospiza birds might not breed witheach other: song and body shape. Bird songs in males are a crucial wayto attract mates. Being able to recognize the shape of a mate is also veryimportant. Bird songs are learned in a very short window of time in asensitive period of a young male's life. G. fortis only sings one song andalthough it varies a bit, it is distinct. Females do not sing, but the choosemates based on the song communication.As members of the interbreeding population were born and learnedsongs, they learned them incorrectly. Figure 2A below shows sonographssongs of the original immigrant (5110), a son (15830) and a fifthgeneration descendant (19668), compared with Figure 2B which showthree Daphne G. fortis individuals that sang a standard form.ASI10G fortis 16858ISK30G fortis 13244219968G fortis S649Time (s)Time (s)(THY) KouanbaaFrequency (kHz)

Various kinds of mechanisms exist to encourage speciation. Various different kinds of barriers and…

Answered: A. In terms of the barriers in place…

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter43: Animal Behavior

Section: Chapter Questions

Problem 2CT

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A. In terms of the barriers in place that keep species separate, explain whether song recognition is a prezygotic barrier or a post-zygotic barrier. B. Explain which type of isolating mechanism this wouldbe once you determine the barrier type. C. Discuss why song would be a barrier to mating with another species and having the incorrect song might change your fitness potential.

Song Differences
There are two main reasons why Geospiza birds might not breed with
each other: song and body shape. Bird songs in males are a crucial way
to attract mates. Being able to recognize the shape of a mate is also very
important. Bird songs are learned in a very short window of time in a
sensitive period of a young male's life. G. fortis only sings one song and
although it varies a bit, it is distinct. Females do not sing, but the choose
mates based on the song communication.
As members of the interbreeding population were born and learned
songs, they learned them incorrectly. Figure 2A below shows sonographs
songs of the original immigrant (5110), a son (15830) and a fifth
generation descendant (19668), compared with Figure 2B which show
three Daphne G. fortis individuals that sang a standard form.
A
SI10
G fortis 16858
ISK30
G fortis 13244
2
19968
G fortis S649
Time (s)
Time (s)
(THY) Kouanbaa
Frequency (kHz)

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