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2. Why does it take a long time for the bear to evolve to have the new traits?

2. Why does it take a long time for the bear to evolve to have the new traits?

Human Anatomy & Physiology (11th Edition)
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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Introduction: Due to global warming, hundreds of polar bears have been rescued from their thawing Arctic icecap, and are being relocated to the Antarctic. A cargo ship carrying hundreds of polar bears (Ursus maritimus) has hit a submerged rock along the way and is starting to sink. While the people were rescued by the Coast Guard, the bears aboard were not so lucky, they have to swim to the nearest shore to survive. Luckily the humans released them from their cages before abandoning ship. There are 3 nearby lands which the bears can reach before they drown or get eaten by hungry sharks, but these bears are not well adapted to survive on this land. Many of them will die. They do, however, have good senses of hearing, sight, and smell, and can eat a wide variety of food; not to mention that they are highly intelligent. Over many thousands of years, random mutation and natural selection will allow some of the bears to evolve into a new species that is better adapted to survival on this new land. Assignment: Knowing what you do now about evolution and Darwin's theory of natural selection, your job is to determine the 6 likely traits that the bears would evolve to have, resulting from the conditions of the new land. Adaptations can be structural (to the body itself, ie. color) or behavioral (mating season, preferred habitat, nocturnal/diurnal, etc). Think about the build and anatomy of a normal polar bear, then draw your new bear the variations and adaptations that may have evolved in your bear species to survive the environment of this new land. You will: 1. Pick one habitat from the list: Sunshine Desert, Muddy Marsh, Berry Patches & Fishing Piers. 2. Draw/modify your bear with 6 adaptations likely developed after 10,000 years of evolution in the habitat selected. Adaptations should be based on the natural selection pressures of the new land. 3. Individually, complete the table that lists your bear's new adaptations, their origins (what they use to look like), and how the adaptation allows the bear to survive. 4. Answer the questions at the bottom of the table.
Transcribed Image Text:Introduction: Due to global warming, hundreds of polar bears have been rescued from their thawing Arctic icecap, and are being relocated to the Antarctic. A cargo ship carrying hundreds of polar bears (Ursus maritimus) has hit a submerged rock along the way and is starting to sink. While the people were rescued by the Coast Guard, the bears aboard were not so lucky, they have to swim to the nearest shore to survive. Luckily the humans released them from their cages before abandoning ship. There are 3 nearby lands which the bears can reach before they drown or get eaten by hungry sharks, but these bears are not well adapted to survive on this land. Many of them will die. They do, however, have good senses of hearing, sight, and smell, and can eat a wide variety of food; not to mention that they are highly intelligent. Over many thousands of years, random mutation and natural selection will allow some of the bears to evolve into a new species that is better adapted to survival on this new land. Assignment: Knowing what you do now about evolution and Darwin's theory of natural selection, your job is to determine the 6 likely traits that the bears would evolve to have, resulting from the conditions of the new land. Adaptations can be structural (to the body itself, ie. color) or behavioral (mating season, preferred habitat, nocturnal/diurnal, etc). Think about the build and anatomy of a normal polar bear, then draw your new bear the variations and adaptations that may have evolved in your bear species to survive the environment of this new land. You will: 1. Pick one habitat from the list: Sunshine Desert, Muddy Marsh, Berry Patches & Fishing Piers. 2. Draw/modify your bear with 6 adaptations likely developed after 10,000 years of evolution in the habitat selected. Adaptations should be based on the natural selection pressures of the new land. 3. Individually, complete the table that lists your bear's new adaptations, their origins (what they use to look like), and how the adaptation allows the bear to survive. 4. Answer the questions at the bottom of the table.
llowing in ur MRNA Table 1: Bear Adaptations and their Benefits 1. Fill out the chart with the bears' 6 adaptations that it has acquired after 10,000 years of evolution while living on the new land. Adaptations for the Land Area called Adaptation Derived From (what Type: Structural, Survival Benefit (new/evolved feature) was it like before) Physiological, or Behavioral 2. Why does it take a long time for the bear to evolve to have the new traits? 3. What would happen if there was not a lot of variety in the bears when they first reached the island? 4. Using the 6 main points of Darwin's Theory of Evolution, describe how and why bears evolved in their new environment. (Include the words: overproduction, natural selection, competition, variation, adaptation, & speciation).
Transcribed Image Text:llowing in ur MRNA Table 1: Bear Adaptations and their Benefits 1. Fill out the chart with the bears' 6 adaptations that it has acquired after 10,000 years of evolution while living on the new land. Adaptations for the Land Area called Adaptation Derived From (what Type: Structural, Survival Benefit (new/evolved feature) was it like before) Physiological, or Behavioral 2. Why does it take a long time for the bear to evolve to have the new traits? 3. What would happen if there was not a lot of variety in the bears when they first reached the island? 4. Using the 6 main points of Darwin's Theory of Evolution, describe how and why bears evolved in their new environment. (Include the words: overproduction, natural selection, competition, variation, adaptation, & speciation).
Expert Solution
2.) Long time in bears evolution -

ANSWER 2.) -Bears are iconic mammals with a complex evolutionary history. Natural bear hybrids and studies of few nuclear genes indicate that gene flow among bears may be more common than expected and not limited to polar and brown bears . Analysis using different statistical methods show that gene flow is not limited to closely related species pairs. Strong ancestral gene flow between the Asiatic black bear and the ancestor to polar, brown and American black bear explains uncertainties in reconstructing the bear phylogeny. Gene flow across the bear clade may be mediated by intermediate species such as the geographically wide-spread brown bears leading to large amounts of phylogenetic conflict.

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