50. The polar bear (Ursus arctos maritimus) is thought to have evolved from the Siberian brown bear (Ursus arctos beringianus), in the Kamchatka peninsula of Russia during the Riss glacial period, about 150,000 years ago, when advancing glaciers isolated a subpopulation of brown bears in Kamchatka, preventing them from interbreeding with the ancestral brown bear population in mainland Asia. As the Kamchatka bears adapted to a tundra habitat (evolving into polar bears), they became distinct from the ancestral brown bears, who remained adapted to a boreal forest habitat. With the boundary between tundra and boreal forest persisting to the present, isolating modern brown bears from polar bears, the descendant species (tundra-dwelling polar bears) probably originated from the ancestral species (boreal forest-dwelling brown bears) by means of which of the following pre-zygotic mechanisms? A. speciation by F2 hybrid breakdown B. allopatric speciation by means of vicariance C. speciation by F1 hybrid inviability D. allopatric speciation by means of dispersal E. speciation by F, hybrid sterility
50. The polar bear (Ursus arctos maritimus) is thought to have evolved from the Siberian brown bear (Ursus arctos beringianus), in the Kamchatka peninsula of Russia during the Riss glacial period, about 150,000 years ago, when advancing glaciers isolated a subpopulation of brown bears in Kamchatka, preventing them from interbreeding with the ancestral brown bear population in mainland Asia. As the Kamchatka bears adapted to a tundra habitat (evolving into polar bears), they became distinct from the ancestral brown bears, who remained adapted to a boreal forest habitat. With the boundary between tundra and boreal forest persisting to the present, isolating modern brown bears from polar bears, the descendant species (tundra-dwelling polar bears) probably originated from the ancestral species (boreal forest-dwelling brown bears) by means of which of the following pre-zygotic mechanisms? A. speciation by F2 hybrid breakdown B. allopatric speciation by means of vicariance C. speciation by F1 hybrid inviability D. allopatric speciation by means of dispersal E. speciation by F, hybrid sterility
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:50. The polar bear (Ursus arctos maritimus) is thought to have evolved from the Siberian brown bear
(Ursus arctos beringianus), in the Kamchatka peninsula of Russia during the Riss glacial period, about
150,000 years ago, when advancing glaciers isolated a subpopulation of brown bears in Kamchatka,
preventing them from interbreeding with the ancestral brown bear population in mainland Asia. As the
Kamchatka bears adapted to a tundra habitat (evolving into polar bears), they became distinct from the
ancestral brown bears, who remained adapted to a boreal forest habitat. With the boundary between
tundra and boreal forest persisting to the present, isolating modern brown bears from polar bears, the
descendant species (tundra-dwelling polar bears) probably originated from the ancestral species (boreal
forest-dwelling brown bears) by means of which of the following pre-zygotic mechanisms?
A. speciation by F2 hybrid breakdown
B. allopatric speciation by means of vicariance
C. speciation by F, hybrid inviability
D. allopatric speciation by means of dispersal
E. speciation by F, hybrid sterility
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