Hybrid break down and hybrid sterility are examples of barriers associated with which process? Objective 24-06 Post-zygotic isolation Pre-zygotic isolation, mating not attempted Pre-zygotic isolation, mating attempted
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Post-zygotic isolation refers to reproductive isolation that occurs *after* the formation of a zygote (fertilized egg). Hybrid breakdown and sterility are examples because they occur after the hybrid offspring has been produced. Show more…
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20. Before transferring sperm to the female during mating, the males of some species of beetles use their copulatory organs to remove the sperm of other males. In cases in which a female mated first with a male of a different species, the male of her own species is particularly adept at removing the other male's sperm. This is an example of isolation. a. geographical b. temporal c. mechanical d. postzygotic e. precoital 21. The sperm of one species of fish is chemically incompatible with the eggs of a closely related species. This type of reproductive isolating barrier is called a. postzygotic isolation. b. gametic isolation. c. low hybrid zygote viability. d. temporal isolation. e. behavioral isolation. 22. Suppose one species of beetle prefers to live and mate in grassy areas and its sibling species prefers sandy soils. This is an example of isolation, and is a form of zygotic isolation. a. temporal; pre b. temporal; post c. behavioral; post d. habitat; pre e. habitat; post 23. Crosses between the flour beetles Tribolium castaneum and T. freemani result in large numbers of hybrids that survive, but are sterile. This is an example of a. low hybrid zygote viability. b. behavioral isolation. c. low hybrid adult viability. d. postzygotic reproductive isolation. e. prezygotic hybrid viability.
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Categorize the following as prezygotic or postzygotic isolating mechanisms. Different mating calls in species of frogs Hybrid sterility Dobzhansky-Muller incompatibilities Different flowering times in plants Haldane's rule prezygotic postzygotic
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