Once the populations are separated evolution can occur through multiple mechanisms. Natural selection could act on each population, where some individuals have favorable traits for survival. Genetic drift can occur, where genotypes become more common due to random chance. These mechanisms can lead to each subpopulation becoming so different, that they can no longer interbreed and are considered separate species. TIME 00 ORIGINAL POPULATION GEOGRAPHIC REPRODUCTIVE SPECIATION BARRIER ISOLATION We have documented many examples of this type of speciation occurring. Darwin's finches are the most famous example. In the model shown below, discuss what kind of geographic barriers would have led to the finch speciation in the Galapagos.

Once the populations are separated evolution can occur through multiple mechanisms. Natural selection could act on each population, where some individuals have favorable traits for survival. Genetic drift can occur, where genotypes become more common due to random chance. These mechanisms can lead to each subpopulation becoming so different, that they can no longer interbreed and are considered separate species. TIME 00 ORIGINAL POPULATION GEOGRAPHIC REPRODUCTIVE SPECIATION BARRIER ISOLATION We have documented many examples of this type of speciation occurring. Darwin's finches are the most famous example. In the model shown below, discuss what kind of geographic barriers would have led to the finch speciation in the Galapagos.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter20: Speciation And Macroevolution

Section: Chapter Questions

Problem 7TYU: According to the punctuated equilibrium model, (a) populations slowly diverge from one another (b)...

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Which of the following statements is true regarding the phrase "adaptive radiation"? O It refers to multiple speciation events within an evolutionary lineage. It refers to many populations of the same species. It is the result of genetic drift occuring many times over evolutionary time. Gene flow is an evolutionary mechanism that can account for adaptive radiations.
Within a population of sunflowers, a new individual has a novel dominant mutation that causes it to flower 4 months earlier than the rest of the population. That sunflower survives and successfully self-fertilizes, leading over time to a novel population that evolves larger leaves and smaller flowers. This new population does not interbreed with the original population, although they are found in the same areas. This is an example of Allopolyploid speciation O Behavioral isolation O Allopatric speciation O Sympatric speciation O Adaptive radiation
Which of the following statements is true? Select one: O a Natural selection selects against those traits of an organism that bring it into a better adaptive relationship with its environment. Ob Natural selection favors those traits of an organism that bring it into a better adaptive relationship with its environment. Which of the following is not required for speciation to occur? Select one O a time Ob niche Oc. interbreeding Od genetic isolation
In a population of lizards, color is genetically determined. The current population has two two phenotypes: blue and yellow. Which of the following scenarios could result in evolution by migration? O A disease indiscriminately reduces the population by 90%. Birds are better able to see and therefor prey on blue lizards The population is joined by individuals from a nearby population that has an allele for a red phenotype. Females preferentially mate with individuals exhibiting the blue phenotype.
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Imagine that you are an evolutionary biologist currenyly studying a particular species of snake on an island off the coast of Durban, South Africa and that you have information indicating that1000 years ago, the same species of snakes in that island was observed to exist in a variety of colours (Red blue,yellow green) and that most of the snakes were blue. This same species of snakes and the same mixof colours were also found on the mainland (i.e Kwazulu Natal) Assuming that all the snakes are descended from an ancestral blue snake, explain this change in colour frequency (evolution) as though it were based solely on each of the following processes. a. Natural selection b. Bottleneck effect c. Founder effect
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