Hybrid populations such as those seen between towhee species complicate the biological species concept because: hybrid individuals result from mating between two different species of towhee, but they are sterile. stable hybrid populations are formed when two different towhee species mate. hybrid populations are in the process of forming a new species. Ohybrid populations are unable to breed with either parent species.

Hybrid populations such as those seen between towhee species complicate the biological species concept because: hybrid individuals result from mating between two different species of towhee, but they are sterile. stable hybrid populations are formed when two different towhee species mate. hybrid populations are in the process of forming a new species. Ohybrid populations are unable to breed with either parent species.

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter12: Processes Of Evolution

Section: Chapter Questions

Problem 8SQ

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Hybrid breakdown refers to which situation? Group of answer choices Two species can hybridize but their offspring do not develop fully or are frail and will not survive to reproduce. Two species can hybridize but their offspring are sterile. None of the above Two species can hybridize and their offspring are ok and can have offspring, but the next generation are more likely to die or will be sterile. Two species can hybridize and fuse back into one species.
a) 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 Z
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
Which of the following is not an example of a postzygotic barrier between different species? The hybrids created by interspecies crosses are usually infertile Separate species typically do not mate since they have different mating displays Often times the embryo created through an interspecies cross fails to develop and dies The hybrids created through interspecies crosses are generally very unhealthy
Which of the following is not a characteristic of r-selected species. O mature early O mature late O more offspring O smaller offspring
Which of the following is most likely seen in hybrid zones where reinforcement is occurring? the genetic distinctness of two gene pools is low increased gene flow O speciation hybrid sterility O a narrow hybrid zone
Distinct species that are able to interbreed in nature are said to “hybridize,” and their offspring are called “hybrids.” The gray oak and the Gambel oak can mate to produce fertile hybrids in regions where they co-occur. However, the gene ﬂow in nature is sufﬁciently limited that, overall, the two species remain phenotypically distinct. If the hybrid offspring survive well and reproduce to the extent that there is a large population of hybrid individuals that breed between themselves but do not interbreed with either of the two original parent species (the gray and the Gambel), which of the following would you say most likely led to the new hybrid species?(a) prezygotic reproductive barriers (b) sympatric speciation (c) allopatric speciation (d) postzygotic reproductive barriers (e) none of the above
cross between two fish species occurs but the developing embryo does not develop. O Hybrid inviability O Developmental isolation O Hybrid sterility O None of the above
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.
The biological species concept is based on the assumption that species are reproductively isolated and do not share genes. And yet a number of organisms that are considered different species hybridize (mate and exchange genes). Hybridization between different species is more common in plants than in animals. Propose some possible reasons for this difference.
When a male sea horse mates with a female leafy sea dragon (a closely related species), they produce fertile hybrids. Breeding studies have shown that offspring of the hybrids are infertile. This is an example of: A Hybrid breakdown B Hybrid infertility C Hybrid inviability D Gametic isolation O EA and D
Of the following, which is an example of a postzygotic barrier? O Due to incompatible interactions between inherited genes, a hybrid fetus is unable to develop, and is aborted. O One species mates in spring, while another mates in summer. O A female spider of one species does not respond to the mating display of a male of a closely related species. O Cell surface proteins of one species eggs prevent sperm from another species attaching, so the sperm cannot fertilize it.