f sperm from one species cannot survive in the reproductive tract of another species, a type of prezygotic isolating mechanism called isolation has occurred.
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Which of the following is an example of postzygotic reproductive isolation? a. Sperm of species A dies in the oviduct of species B before fertilization can take place. b. Hybrid zygotes between species A and B are spontaneously aborted early in development. c. The mating seasons of species A and B do not overlap. d. Males of species A are not attracted to the pheromones produced by the females of species B
Adi S.
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.
Prezygotic isolating mechanisms prevent hybrid of fspring from occurring between species because (a) the resulting offspring are not fertile and cannot reproduce. (b) the egg and sperm fuse and form a zygote, but it does not survive. (c) the egg and sperm do not ever meet or, if they do, cannot fuse to form a zygote. (d) all of the above
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