13-18 the species Drosophila pseudoobscura respond less well to the courtship si

Question

13-18 the species Drosophila pseudoobscura respond less well to the courtship signals from males of their close relative Drosophila species. This is an example of A) gametic isolation. B) hybrid infertility C) behavioral isolation. D) adaptive radiation. E) sympatric speciation. 14. The sperm of one species of sea urchin 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) Both a and b 15. Features shared by two or more species that are inherited from the same common ancestor are A) analogous. B) aligned. C) homologous. D) coincident. E) coordinate. Despite inhabiting overlapping ranges, the western spotted skunk and the eastern spotted skunk do not interbreed. One reason for this lack of interbreeding is that the western species breeds in early fall and the eastern species breeds in late winter to early spring. This is an example of isolation. A) chemical B) gametic C) postzygotic D) temporal E) mechanical 16. 17. A group that includes the common ancestor and some, but not all, of its descendants is considered to be A) paraphyletic. B) polyphyletic. C) synapomorphous. D) monogamous. E) monophyletic. irections: Cirele your ENTIRE ANSWER. (1.72 pts. each) 18. Cytochrome c is an important component of the respiratory chain in the mitochondria and is found in all eukaryotes. A) True B) False

Explanation / Answer

13) behavioural isolation.As the species engage in distinct courtship and mating rituals

14)gametic isolation.Interbreeding is prevented by structural or molecular blockage of the formation of zygote.It includes the inability of sperm to bind with egg in animal or the female reproductive organs of a plant preventing the worng pollinator from landing.

15) homologus

16) temporal isolation which means species breed at different times.

17) monophyletic.

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