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eco and evo test 2
Terms in this set (41)
Brightly colored peacocks mating more frequently than drab peacocks would result in ________
Which describes an African butterfly species that exists in two strikingly different color patters?
Most Swiss starlings produce four to five eggs in each clutch. Those producing fewer or more than this have reduced fitness. Which of the following terms best describes this?
Sexual dimorphism is most often a result of?
In frequency-dependent selection, the fitness of a phenotype____ if it becomes the least common one in the population.
the speciation of a new plant species by accidents during nuclear division, is an example of ___________
A biologist discovers two populations of wolf spiders that appear identical. Members of one population live in the leaf litter deep in the woods. Members of the other population live in grass at the edge of the woods. She decides to designate the two populations as two separate. Which species concept is this?
The difference between geographical isolation and habitat differentiation is the ____
-ploidy of the two populations as speciation occurs
-speed at which two populations undergo speciation
-amount of genetic variation that occurs among two gene pools as speciation occurs
-identity of the phylogenetic kingdom or domain in which these phenomena occur
-None of the above***
a rapid ,method of speciation that has been important in the history of flowering plants is_____
the phenomenon of fusion is likely to occur when, after a period of genetic isolation, two populations that diverged meet again____
reproductive barriers are weakened resulting in the formation of a single species
which of these should increase in hybrid zones where reinforcement is occurring?
the genetic distinction of two gene pools
The most likely explanation for the high rate of sympatric speciation that apparently exists among the cichlids of Lake Victoria in the past is _______
the most likely explanation for the recent decline in cichlid species diversity in lake victoria is _______
A hybrid zone is properly defined as ___________
an area where mating occurs between 2 closely related species, with viable offspring
in the narrow hybrid zone that separates the toad species Bb and Bv, what is true of those alleles that are unique to the parental species?
the alleles' heterozygosity should be higher among the hybrid toads there
According to the concept of punctuated equilibrium, the "sudden" appearance of new species in the fossil record means that ____________
speciation occurred rapidly in geological time
according to the concept of punctuated equilibrium_____
a new species accumulated most of its unique features as it comes into existence
can involve changes involving a single gene
Which of the following statements about speciation is correct?
speciation is a basis for understanding macroevolution
which of the following factors would not contribute to allopatric speciation?
gene flow between the two populations is extensive
which gas was least abundant in Earth's early atmosphere?
in their laboratory simulations of the early Earth, Miller and Urey observed the abiotic synthesis of
which is a defining characteristic that all protobionts must have had in common?
a surrounding membrane or membrane-like structure
RNA molecules can both carry genetic information and be catalytic. This supports the proposal that
RNA was the first hereditary information
if the half-life of some element is about 3,000 years, then a sample that has 1/16 the normal proportion of parent material to daughter material should be about how man years old?
which measurement would help determine absolute dates by radiometric means?
the accumulation of the daughter isotopes
the loss of parent isotopes
how many half-lives should have elapsed if 25% of the parent isotope remains in a fossil at the time of analysis?
approximately how far back in time does the current fossil record extend?
fossilized stromatolites ________________
resemble structures formed by bacterial communities found today
Which of the following is the correct sequence of events in the origin of life?
synthesis of organic monomers
synthesis of organic polymers
formation of protobionts
formation of DNA-based genetic systems
the first "genes" on earth were probably ______________
auto-catalytic RNA molecules
which free-living cells were like the earliest contributors of oxygen to Earth's atmosphere?
the hypothesis of endosymbiosis proposes that _______ were formerly small prokaryotes
mitochondria and plastids
An early consequence of the release of oxygen gas by photosynthesis was to_____________
make life difficult for aerobic organisms
Which of the following statements provide the strongest evidence that prokaryotes evolved before eukaryotes?
the oldest fossilized cells resemble prokaryotes
the oldest fossils of eukaryotic cells date back _______
which species concept distinguishes species based on the degree of genetic exchange between their gene pools?
two species of frogs belonging to the same genus occasionally mate, but the offspring fail to hatch and develop. What is the mechanism for keeping the two frog species separate?
the post zygotic barrier called hybrid inviability
which of the following statements about species, as defined by the biological species concept, is (are) correct?
-biological species are defined by reproductive isolation
-the biological species is the largest unit of population in which successful reproduction is possible
which example below will most likely guarantee that two closely related species will persist only as distinct biological species?
reproductive isolation from one another
if, on average, 46% of the loci in a species' gene pool are heterozygous, then the average homozygosity of the species should be
Recommended textbook explanations
Kenneth R. Miller, Levine
Texas Science Fusion: Grade 7
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