Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 18, Problem 2VCQ
Figure 18.22 If two species eat a different diet but one of the food sources is eliminated and both species are forced to eat the same foods, what change in the hybrid zone is most likely to occur?
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The approximately 600 species of cichlids in East Africa’s Lake Victoria have largely resulted from sympatric speciation. The closely related cichlids species P. pundamilia and P. nyererei are thought to have arisen by sexual selection. Mate choice by females strongly favors males of their own species that have different body colors. In recent years, pollution has caused the water of Lake Victoria to become turbid in some areas. Hybrids of P. pundamilia and P. nyererei were produced and the gene pools of the two species have started to fuse, creating a new hybrid species.
In this process, what are the conditions that led to the fusion of P. pundamilia and P. nyererei?
A. Only the prezygotic reproductive barrier is not complete for the two species.
B. Only the postzygotic reproductive barrier is not complete for the two species.
C. Both the prezygotic and the postzygotic reproductive barriers are complete for the two species.
D. Both the prezygotic and the postzygotic reproductive…
Two species of plants grow along a mountain slope. One species grows mainly at low altitudes, and the other grows mainly at higher altitudes. Occasionally, the two species hybridize producing hybrids that are better suited than the parental species to grow at intermediate altitudes. This scenario would lead to
Question 7 options:
reinforcement
autopolyploidy
a stable hybrid zone
hybrid breakdown
the fusion of the two species
If a geographic barrier is removed and the two reunited populations intermingle and breed, what attributes must the offspring have in order for the two populations, according to the biological species concept, to be considered still the same species?
Chapter 18 Solutions
Biology 2e
Ch. 18 - Figure 18.14 Which is most likely to survive,...Ch. 18 - Figure 18.22 If two species eat a different diet...Ch. 18 - Figure 18.23 Which of the following statements is...Ch. 18 - Which scientific concept did Charles Darwin and...Ch. 18 - Which of the following situations will lead to...Ch. 18 - Which description is an example of a phenotype? A...Ch. 18 - Which situation is most likely an example of...Ch. 18 - Which situation would most likely lead to...Ch. 18 - What is the main difference between dispersal and...Ch. 18 - Which variable increases the likelihood of...
Ch. 18 - What is the main difference between autopolyploid...Ch. 18 - Which reproductive combination produces hybrids?...Ch. 18 - Which condition is the basis for a species to be...Ch. 18 - Which situation is not an example of a prezygotic...Ch. 18 - Which term is used to describe the continued...Ch. 18 - Which components of speciation would be least...Ch. 18 - If a person scatters a handful of garden pea plant...Ch. 18 - Why do scientists consider vestigial structures...Ch. 18 - How does the scientific meaning of “theory” differ...Ch. 18 - Explain why the statement that a monkey is more...Ch. 18 - Why do island chains provide ideal conditions for...Ch. 18 - Two species of fish had recently undergone...Ch. 18 - Why can polyploidy individuals lead to speciation...Ch. 18 - What do both rate of speciation models have in...Ch. 18 - Describe a situation where hybrid reproduction...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Imagine there's a species of flower that blooms in early April. Some seeds are blown over a mountain and the offspring of those seeds start a new population on the other side. After several million years the mountain erodes and the two flower populations are reintroduced to each other. The population that lived on the far side of the mountain flowers in early May, while the other still flowers in early April. The two populations never hybridize, and become their own species. This is an example of: Gametic Barrier Temporal Isolation O Habitat Isolation O Behavioral Isolation 1.arrow_forwardDecide whether each of the following scenarios would lead to prezygotic or postzygotic reproductive isolation: a) Dragonflies from two different populations have genitals that do not match, so they can't mate successfully [Select ] b) Two different species of fish have very different courtship displays, but they can mate and produce a non-fertile offspring [Select] c) One species of plant flowers in the winter, while another flowers in early spring [ Select ] d) The gametes of two tree species can fuse, but a zygote does not form [ Select ] e) A mountain range separates two populations of snakes I Select]arrow_forwardThere is a fish species that lives in a lake. As the fish population grows, competition for food increases and a group of fish locates a new food source at a different depth in the lake. Over time, two populations with distinct morphologies that allow them to eat various food sources begins to occur in the lake. Which type of speciation (allopatric or sympatric) will mostly likely occur? Why?arrow_forward
- An event occurs where a large population of photosynthetic sun-basking sharks move to a new geographical location, and are unable to return. In their new location, they must rely much more on consuming fish for nutrients, as there are less available places to bask/rest, and higher risk for hunting if they remain at the surface for long periods of time. What type of prezygotic isolating mechanism occurred? In 100 years, how do you think the relocated sharks will differ physically from the original population? Give at least 2 features and explain why you think so.arrow_forwardWhat 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.arrow_forwardDescribe two mechanisms that can decrease gene flowin sympatric populations, thereby making sympatricspeciation more likely to occur.arrow_forward
- If the hybrids do not become reproductively isolated from their parent species and form a new species, what are the three possible outcomes for the hybrid zone over time?arrow_forwardIn lizard species "A" the males approach the females directly, bobbing their whole body up and down and displaying their bright blue belly patches as they do so. In lizard species "B", the males slither around the female and bob only their heads. They have no belly patches at all. The females of each species will reject the males of the other species because of these differences. This is an example of isolation. habitat and post-zygotic habitat and pre-zygotic mechanical and post-zygotic behavioral and post-zygotic isolation behavioral and pre-zygotic mechanical and pre-zygoticarrow_forwarda) How many of the gene trees do you expect to look like the species tree? b) You observe three gene trees in which species X and Z are the closest relatives and seven gene trees where X and Y are the closest relatives. What can you conclude from these data? Group of answer choices Historical hybridization between species W and X Historical hybridization between species X and Y Historical hybridization between species X and Z Historical hybridization between species Y and Zarrow_forward
- In the United States, the rare red wolf (Canis lupus) has been known to hybridize with coyotes (Canis latrans), which are much more numerous. Although red wolves and coyotes differ in terms of morphology, DNA, and behavior, genetic evidence suggests that living red wolf individuals are actually hybrids. Red wolves are designated as an endangered species and hence receive legal protection under the Endangered Species Act. Some people think that their endangered status should be withdrawn because the remaining red wolves are hybrids, not members of a "pure" species. Do you agree? Why or why not?arrow_forwardWhich of the following statements about sympatric speciation is correct? It is a process through which two populations can diverge and develop reproductive isolation while in two different geographic area. It is the most common mechanism for populations to form independent species. Postzygotic isolation is the main form of reproductive isolation for the sympatric speciation process. Genetic isolation through large scale chromosomal mutations, such as chromosome inversion or polyploidy, are more likely contributing to sympatric speciation. None of the abovearrow_forwardAssume you are studying secondary contact in two species of birds. You notice that hybrids are produced and that much of the DNA of each species is becoming more similar over time. The likely end point of this process is which of the following? Fusion Evolution of reproductive isolation Reinforcement Stable and minimal hybrid productionarrow_forward
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