Chapter Questions
__________ is the original source of new alleles.a. Mutationb. Natural selectionc. Genetic driftd. Gene flowe. All are original sources of new alleles
Individuals don't evolve; __________ do.
Evolution can only occur when ___________ .a. mating is randomb. there is selection pressurec. neither is necessary
Match the modes of natural selection with their best descriptions.a. eliminates extreme forms of a traitb. eliminates midrange forms of a traitc. shifts allele frequencies in one direction_____stabilizing _____directional _____disruptive
Sexual selection, such as competition between males for access to fertile females, frequently influences aspects of body form and can lead to ____________ .a. male/female differencesb. male aggressionc. exaggerated traitsd. all of the above
The persistence of the sickle allele at high frequency in a population is a case of _______________ .a. bottleneckingb. balanced polymorphismc. natural selectiond. inbreedinge. both b and $\mathrm{d}$
___________ tends to keep different populations of a species similar to one another.a. Genetic driftb. Gene flowc. Mutationd. Natural selection
The theory of natural selection does not explain ____________ . a. genetic driftb. the founder effectc. gene flowd. how mutations arisee. inheritancef. any of the above
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 __________.a. allopatric speciationb. adaptive radiationc. sympatric speciationd. an evolutionary bottleneck
Sex in many birds is typically preceded by an elaborate courtship dance. If a male's movements are unrecognized by the female, she will not mate with him. This is an example of ___________ .a. reproductive isolationb. behavioral isolationc. sexual selectiond. all of the above
Cladistics ___________.a. is a way of reconstructing evolutionary historyb. may involve parsimony analysisc. is based on derived traitsd. all of the above are correct
In cladistics, the only taxon that is always correct as a clade is the ____________a. genusb. familyc. speciesd. kingdom
In evolutionary trees, each node represents a(n) ___________.a. single lineageb. extinctionc. point of divergenced. adaptive radiation
In cladograms, sister groups are __________ .a. inbredb. the same agec. represented by nodesd. members of the same family
Match the evolution concepts.a. can lead to interdependent speciesb. changes in a population's allele frequencies due to chance alonec. alleles enter and leave a populationd. evolutionary historye. adaptive traits make their bearers better at securing matesf. burst of divergences from one lineage into manyg. no more living membersh. diagram of sets within setsgene flow sexualselectionextinctgeneticdriftcladogram adaptive radiation coevolution phylogeny