Reproductive isolation is ________ by natural selection to lead to speciation.
Fill in the blank(s) with the appropriate word(s).
reinforced
Incomplete isolating mechanisms are reinforced by natural selection until they are completely effective.
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Refer to the table above. Because the shark rectal gland functions only when ATP molecules are present, what can you infer about the movement of Na+, K+, and Cl-?
A) Movement of these ions from circulation into the rectal gland is an active process. B) Movement of these ions takes place from a region of higher concentration to a region of lower concentration. C) These ions move into the rectal gland down their concentration gradient. D) The rectal gland is unable to concentrate these ions.
During this stage of mitosis, the chromosomes become attached to the spindle at their kinetochores.
A. Prophase B. Prometaphase C. Metaphase D. Anaphase E. Telophase
You have conducted an Ames test on a given compound. Which of the following would be classified as a positive result on the Ames test?
A) his – strain grows on an his – plate. B) his – strain grows on an his+ plate. C) his+ strain grows on an his – plate. D) his+ strain grows on an his+ plate. E) his+ strain grows on either an his – or an his+ plate.
Choose the best cause and effect sequence for the process of speciation by natural selection.
A. Variation --> Reproductive Isolation --> Speciation --> Mutation --> Selection B. Variation --> Selection --> Reproductive Isolation --> Mutation --> Speciation C. Selection --> Speciation --> Reproductive Isolation --> Variation --> Mutation D. Speciation --> Reproductive Isolation --> Selection --> Mutation --> Variation E. Mutation --> Variation --> Selection --> Reproductive Isolation --> Speciation