A species that has a high rate of long-distance dispersal is more likely to colonize new habitat. But that species may also be less likely to adapt to local conditions, because migration will be stronger than local selection pressures for many loci. In light of those considerations, when do you expect that increasing dispersal might result in the evolution of a larger geographic range, and when might it not?

A species that has a high rate of long-distance dispersal is more likely to colonize new habitat. But that species may also be less likely to adapt to local conditions, because migration will be stronger than local selection pressures for many loci. In light of those considerations, when do you expect that increasing dispersal might result in the evolution of a larger geographic range, and when might it not?

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter11: Evolution And Its Processes

Section: Chapter Questions

Problem 11RQ: What is the main difference between dispersal and vicariance? a. One leads to allopatric speciation,...

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A species that has a high rate of long-distance dispersal is more likely to colonize new habitat. But that species may also be less likely to adapt to local conditions, because migration will be stronger than local selection pressures for many loci. in light of those considerations, when do you expect that increasing dispersal might result in the evolution of a larger geographic range, and when might it not? Your answer
Choose True for yes and False for no, for each of the statements 1) The distribution of the two species-C populations cannot be explained by two totally independent dispersal events by the common ancestor species of A and B. True or false 2) B must share a more recent common ancestor with C1 than it does with C2. True or false
Which of the following models, that attempt to explain human origins and dispersal, no longer is supported due to current information supplied by genetic evidence? In other words, which model has been thrown out while the other two are still being debated? Group of answer choices multiregional model partial replacement model complete replacement model
Think about the pattern of human dispersal. Given what you know about the founder effect, would you expect populations native to South America to be more or less genetically diverse than those native to North America?Explain your reasoning
What is an example of how migration causes changes in gene frequencies? Genetic material can become lost over time due to lack of reproduction when animals migrate. When animals migrate, their genes mutate on their own, changing the frequency that a gene allele shows up. When animals migrate, the mating becomes less random, causing inbreeding and, therefore, shifts in the proportion of alleles. Seeds of plants are carried to different locations and introduced to a new population, adding their own genetic material and, therefore, changing gene frequencies.
Through the human introduction of invasive species and forced migration of various species such as pack mules, elk, and hog-nosed skunks into the Kaibab squirrels’ habitat, scientists hypothesize two outcomes that might occur to the squirrel population. Examine the following null hypotheses formulated to explain rates of speciation and extinction of the Kaibab squirrel population as an influx of species continues to migrate into their niche. Null Hypothesis: The rate of speciation (C) remains steady when species compete for available resources while all will continue toward extinction (B). Which of the following graphically depicts the alternative hypotheses?
What makes the ecosystem of the Galapagos Island different than those found on large continentals? Upon what did Charles Darwin's original research on finches of the Galapagos Island focus? Describe the research Peter and Rosemary Grant conducted on the finches in the 1970's. Discuss the relationship between the finches' beak depth size and survival in terms of natural selection and fitness and the environmental causes that shaped the finch population of the islands.
Consider this example. Shorebirds on the Eastern coast of North America feed on the mollusks and tiny crabs along the shore. Birds with tougher beaks are better adapted to crack open the shells of the mollusks, and birds with sharper beaks are better adapted to pierce the shells of crabs. Over time, the shorebirds become two separate species that no longer breed with one another. What type of speciation has occurred? A. Sympatric speciation B. Adaptive speciation C. Microevolution speciation D. Allopatric speciation
Scientists tracked the year populations of two species of bush cricket were first recorded throughout their current ranges, using published records of the species. They found that the range of each species has changed over time (Figure 19.9C and D). They also determined the proportion of long-winged individuals in the populations, and analyzed that proportion according to the date a population was first discovered (Figure 19.9E and F). What is the relationship between range expansion and proportion of long-winged form in a population? C. 1.0- 1.0 0.8- 2 0.8- 0.6- 0.6- 0.4- 0.4- 0.2- 0.2 0- 1920 year of first record 0+ 1960 2000 1920 1960 2000 year of first record Figure 19.9 (Note: A and B not shown here). C, Distribution of C. discolor. Blue circles are locations where the cricket was first recorded between 1961 and 1987, yellow circles are locations where it was first recorded between 1988 and 1996, and red circles are locations where it was first recorded between 1997 and 1999. D,…
In the model shown below, discuss what kind of geographic barriers would have led to the finch speciation in the Galapag
How does one species diverge from another? (When do we call a group a new species—and how does that process happen?) Using anole lizards or another very specific example(s), compare and contrast microevolutionary processes with speciation. As you discuss speciation, be sure to compare and contrast sympatric speciation with allopatric speciation and say whether the example you’ve chosen is allopatric or sympatric.
What are examples for gene flow? Select all that apply A distinct population of iguana drift to a new island that is already inhabited by members of the same species. A small population of humans colonizes a newly formed island. A fire drastically reduces the size of a white-tailed deer population. The remaining individuals spread out throughout the remaining forest. Wind blows pollen from one population of plants to another and cross-fertilization occurs. n An earthquake results in the formation of a canyon, splitting a population of toads apart.