Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian Islands have different elaborate courtship rituals. These rituals involve fighting other males and making stylized movements that attract females
What type of reproductive isolation does this represent?
A) habitat isolation
B) temporal isolation
C) behavioral isolation
D) gametic isolation
Answer: C
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In marine environments, salinity averages about ____%
a. 1 b. 3 c. 8 d. 12 e. 25
A human X-linked gene is
a. found only in males. b. more frequently expressed in females. c. found on the Y chromosome. d. transmitted from father to son. e. found on the X chromosome.
The average number of female offspring born to a female over her lifetime is referred to as the
A) crude birthrate. B) age-specific birthrate. C) gross reproductive rate. D) net reproductive rate.
What is the difference between Ras and the G proteins bound to G protein-coupled receptors (GPCRs)?
A. Ras is a second messenger, and the G proteins bound to GPCRs are not second messengers. B. Ras is an enzyme, and the G proteins bound to GPCRs are not enzymes. C. Ras can activate different effector molecules, and the G proteins bound to GPCRs cannot activate different effector molecules. D. Ras is a small G protein, and the G proteins bound to GPCRs are not small G proteins.