In the science fiction film, When Worlds Collide, 100 individuals are selected to leave a doomed Earth in a spaceship to re-establish humanity elsewhere. This scenario illustrates
A) a founder effect.
B) a mutation effect.
C) a population funnel.
D) a deleterious allele.
A) a founder effect.
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The most important stimulus in the control of respiration is the concentration in the blood and other body fluids of
(a) oxygen (O2). (b) carbon dioxide (CO2). (c) hydrogen ions (H+). (d) nitrogen (N2).
A species of trilobite was found in the fossil record. At its first appearance, it is similar to an ancestor species but differs from the ancestor in several key characteristics. It seems to change little over several million years, then is extinct. This illustrates the concept of
A. punctuated equilibrium. B. gradualism. C. developmental evolution. D. anagenesis. E. evo-devo.
Which statement is true of the female gametophyte of pine?
a. It's a product of repeated cell divisions of the functional megaspore. b. It's haploid. c. It serves as the stored food to be used by the embryo sporophyte upon germination. d. All of the above are true.
The peppered moth provides a well-known example of natural selection. The light-colored form of the moth was predominant in England before the Industrial Revolution. In the mid-nineteenth century, a dark-colored form appeared. The difference is produced by a dominant allele of one gene. By about 1900, approximately 90% of the moths around industrial areas were dark colored, whereas light-colored moths were still abundant elsewhere. Apparently, birds could readily find the light moths against the soot-darkened background in industrial areas and, therefore, were eating more light moths. Recently, use of cleaner fuels has greatly reduced soot in the landscape, and the dark-colored moths have been disappearing. Should the two forms of moths be considered separate species?
A) Yes, because natural selection has affected the frequency of the two different forms. B) Yes, because they have completely different coloration. C) Yes, because they are reproductively isolated based on habitat. D) No.