Biology
Biology
12th Edition
ISBN: 9781260494570
Author: Raven, Peter
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 22, Problem 1A

If reinforcement is weak and hybrids are not completely infertile,

a. genetic divergence between populations may be overcome by gene flow.

b. speciation will occur 100% of the time.

c. gene flow between populations will be impossible.

d. the speciation will be more likely than if hybrids were completely infertile.

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Students have asked these similar questions
Two parents, who are thought to be different species, mate and produce viable hybrid offspring. When two of these hybrids mate, their offspring are not viable.  What is the BEST interpretation of this data?   A. The original parents are the same species because they can breed together.   B. The original parents are the same species because they can breed together and produce viable offspring.   C. The original parents are not the same species because they produce hybrids that impair the species’ development or survival in its environment.   D. The original parents are not the same species because they produce hybrids that can have reduced viability and fertility when they mate.
Problems with the biological species concept include the fact that a. many species reproduce asexually. b. postzygotic isolating mechanisms decrease hybrid viability. c. prezygotic isolating mechanisms are extremely rare. d. All of the choices are correct.
Which of the following would be a good example of premating reproductive isolation? A. Cross-fertilizations between the gray treefrogs, Hyla versicolor and H. chrysoscelis result in a high degree of mortality prior to hatching of hybrid eggs. B. The mule, a hybrid between horses and donkeys is viable, but sterile. C. Males of H. versicolor produce an advertisement call with a much slower pulse rate than males of H. chrysoscelis and females use pulse rate differences to avoid mating with the wrong species. D. Hybrid offspring are produced from matings between leopard frogs and green frogs, but usually die before the tadpoles metamorphose into froglets.
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Mechanisms of Genetic Change or Evolution; Author: Scientist Cindy;https://www.youtube.com/watch?v=5FE8WvGzS4Q;License: Standard Youtube License