EP BIOLOGY:SCIENCE F/LIFE...-MOD.ACCESS
6th Edition
ISBN: 9780134839530
Author: BELK
Publisher: PEARSON CO
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Chapter 12, Problem 2AAATB
Summary Introduction
To research:
The reason for the evolution of striped zebras from the unstriped zebras.
Introduction:
Natural selection can be defined as an individual’s differential survival and reproduction of individuals as a result of changes in
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Steven Frank and Laurence Hurst argued that a cytoplasmically inherited mutation in humans that has severe effects in males but no effect in females will not be eliminated from a population by natural selection because only females pass on mtDNA. Using this argument, explain why males with Leber hereditary optic neuropathy are more severely affected than females.
How might an evolutionary biologist explain why a species of salamander becomes blind after colonizing a cave?
Group of answer choices
Members of the ancestral population that colonized the cave differed in their ability to see. If maintaining the ability to see in the cave was a waste of energy, blind salamanders might actually have more offspring than those who could see.
It is possible that in the cave there is a source of pollution that increases the mutation rate for a gene that makes salamanders blind. Over time, due to exposure to this chemical, the membersof the population lose their sight.
There is no way to explain this in terms of natural selection.
The members of this salamander species no longer needed to use their eyes. Over time, due to lack of use, they lost the ability to see.
The dog breed West Highland Terrier is a product of artificial selection. Give a brief description of the breed and its desired traits. What wild ancestor did it come from? Was it produced with selective breeding or genetic engineering (i.e. genetically modified)? What are the benefits of artificial selection in this case? Are there potential negative consequences?
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