The operation of natural selection depends upon the fact that ____.
A. the strong always survive, whereas the weak always die
B. some individuals have a better chance to produce more offspring
C. mutations are always harmful
D. acquired characteristics are inherited
E. reproduction of all members of a species follows the same path
Answer: B
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Based on the ABC model, what would be the structure of a flower from the outermost whorl that had normal expression of genes A and C and expression of gene B in all four whorls?
A) carpelâ€"petalâ€"petalâ€"carpel B) petalâ€"petalâ€"stamenâ€"stamen C) sepalâ€"carpelâ€"carpelâ€"sepal D) sepalâ€"sepalâ€"carpelâ€"carpel E) carpelâ€"carpelâ€"carpelâ€"carpel
Dissolved oxygen is highest in which body of water?
a. warm eutrophic lake b. slow-moving tropical river c. pool within a cool forest stream d. white water stretch of a cold river e. dissolved oxygen should be the same in all waters
The Kuna tribe, which inhabits islands off the coast of Panama, has almost no incidence of heart disease due to ____
a. the unusually large amount of cocoa they consume b. the unusually small amount of red wine they consume c. the unusually large amount of coffee they consume d. the absence of disease-carrying mosquitoes on the islands e. an allele that is unique to their tribe
A researcher studying a member of the Conus genus of cone snails discovers that there are many dozens of slightly different variants of venom proteins coded by closely related genes. What is the most likely explanation for this great variation? [Hint: The compounds likely diversified in a similar way as the multiple globin proteins in mammals did.]
A. Concerted evolution resulted in the production of many venom genes, scattered throughout the genome. B. Hybridization between two snail species has left the offspring with multiple orthologous genes. C. Multiple gene duplication events have led to the production of a paralogous multigene family. D. Duplicated genes underwent incomplete gene conversion, leading to many errors in sequence. E. The last common ancestor of all cone snails had a diverse set of venom genes that have been inherited by all cone snails.