A virgin pine forest covers a valley, and one of the inhabitants is a red squirrel species. A large volcanic eruption occurs and separates the valley with a huge lava flow, thus producing two populations of squirrels. What must occur for the two populations of squirrels to be considered separate species?
A. The two squirrel populations must select mates using different behaviors.
B. The two squirrel populations must be reproductively isolated.
C. The environment must change so that the populations exist in distinct habitats.
D. The two squirrel populations must feed on different species of plants.
E. The fur color or other morphological characteristic of the two squirrel populations must become distinct.
Answer: B
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A vasectomy is a surgical procedure in which the vas deferens are severed, and then sealed with a laser. How would this cause sterility?
A. Sperm cannot be produced by meiosis. B. Sperm cannot be produced by mitosis. C. Sperm cannot move to the urethra. D. A man cannot get an erection. E. The testes stop producing testosterone.
After several generations of selectively breeding mice in a laboratory, Ted Garland and his colleagues established populations of mice that voluntarily chose to run great distances on exercise wheels
The process of establishing these populations of mice is termed ________. A) natural selection B) artificial selection C) population selection D) experimental selection E) random selection
Animals that are being hunted (often illegally) for body parts thought to have medicinal value include:a
rhinos and bears. b. cheetahs and snow leopards. c. snow leopards and bears. d. wolves and mountain lions. e. mountain lions and black-footed ferrets.
The genetic contribution of an individual to subsequent individuals through its own offspring and its influence on the survival of other relatives is referred to as:
a) inclusive fitness. b) altruism. c) the protector effect. d) individual fitness. e) inclusive altruism.