Chapter 17
Biology Concepts and Applications · 6 exercises
Problem 1
_________ is the original source of new alleles. a. Mutation b. Natural selection c. Genetic drift d. Gene flow e. All are original sources of new alleles
8 step solution
Problem 3
Match the modes of natural selection with their best descriptions. ______ stabilizing ______ directional ______ disruptive a. eliminates extreme forms of a trait b. eliminates midrange forms of a trait c. shifts allele frequency in one direction
6 step solution
Problem 5
The persistence of the sickle allele at high frequency in a population is an example of ________. a. bottlenecking b. inbreeding c. natural selection d. balanced polymorphism
4 step solution
Problem 6
_______ tends to keep populations of a species similar to one another. a. Genetic drift b. Gene flow c. Mutation d. Natural selection
3 step solution
Problem 7
The theory of natural selection does not explain ______. a. genetic drift b. the founder effect c. gene flow d. how mutations arise e. inheritance f. any of the above
4 step solution
Problem 8
A fire devastates all trees in a wide swath of forest. Populations of a species of tree-dwelling frog on either side of the burned area diverge to become separate species. This is an example of ______.
4 step solution