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9 Cards in this Set

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  • Back
Can selection create the best of all possible genes for a particular task?
No; it has to wait for mutations to occur by chance. If "better' allele does not appear, there is nothing selection can do about it, because selection is a consequence of the confluence of certain conditions
Define fitness.
Higher reproductive success or higher genetic success
What is an adaptation?
A hereditary trait
What is a fitness benefit?
Refers to the positive effect of a trait on the number of surviving offspring, produced by an individual or the number of copies of its alleles that it contributes to the next generation?
What is a fitness cost?
Refers to the damaging effects of the trait
What is the bottom line of an individual's reproductive success?
The total number of his or her offspring that reach the age of reproduction
What is the comparative method?
Testing prediction about the evolution of an interesting trait by looking at animals other than the species whose characteristics are under investigation
What is Occam's razor?
Principle of parsimony; holds that simpler explanations are more likely to be correct than complex ones.
Describe how squirrels assess their level of mobbing?
Squirrels are less eager to approach speakers playing the rattles of larger and warmer snakes; this ability to assess the risk of snakebite enables the squirrels to reduce the costs of their mobbing behavior