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Practice Exam Missed Questions

Terms in this set (10)

which of the various species concepts distinguishes two species based on whether genes are exchanged between their gene pools?
a. phylogenetic
b. morphological
c. biological
d. ecological
biological
The higher the proportion of loci that are "fixed" in a population, the lower is that populations______
a. nucleotide variability
b. average heterozygosity
c. diploidy
d. a and b
e. all
a and b
Races of humans are unlikely to evolve extensive differences in the future for which of the following reasons?
I. the environment is unlikely to change
II. human evolution is complete
III the human races are incompletely isolated
The human races are incompletely isolated
Which statement about variation among individuals of a species is true?
A. all genetic variation produces phenotypic variation
b. all nucleotide variability results in neutral variation
c. all new alleles are the result of nucleotide differences
d. all geographic variation results from the existence of clines
e. all phenotypic variation is the result of genotypic variation
All new alleles are the result of nucleotide differences.
During breeding season, female house finches prefer to mate with males with the brightest red feathers. Which of the following is true?
A) Alleles that promote more effective deposition of carotenoid pigments in the feathers of males should increase over the course of generations.
B) Alleles that promote more efficient acquisition of carotenoid-containing foods by males should increase over the course of generations.
C) There should be directional selection for bright red feathers in males.
D) All three of these.
E) Only B and C.
All three
In a hypothetical populations gene pool, an autosomal gene, which had previously been fixed, undergoes a mutation that introduces a new allele, one inherited according to incomplete dominance. Natural selection then causes stabilizing selection at this locus. Consequently what should happen over the course of many generations?
a. the proportions of both types of homozygote should decrease.
b. the proportion of the population that is heterozygous at this locus should remain constant
c. the population's average heterozygosity should increase
d. both a and b
e. both a and c
both a and c
You have before you an assortment of fossil crabs that colleagues from around the world sent you and now you must assign these to separate species. Which species concept will you use?
Morphological
22) A city's parks were intensively treated with "Weed-B-Gone" in the 1950's in an effort to eradicate dandelions. The number of dandelions in the parks was immediately greatly reduced. Each year thereafter, the city's parks were again treated with Weed-B-Gone, but the dandelions gradually increased in number until 15 years later they were almost as abundant as they were when the weed-control program was begun.
Which statement below best explains these observations?
A) Dandelions from the surrounding countryside moved in and replaced those killed by Weed-B-Gone.
B) The few dandelion plants that survived the initial treatment developed antibodies in response to the chemical and passed this ability on to their offspring.
C) Weed-B-Gone caused new mutations in to occur in the surviving dandelions and this allowed them and thier offspring to survive.
D) Weed-B-Gone killed susceptible dandelions but a few resistant survivors reproduced and their offspring gradually repopulated the parks. E) All of the above
D. Weed-B-Gone killed susceptible dandelions but a few resistant surviors reproduced and their offspring gradually repopulated the park
Which of these is the smallest unit that natural selection can change?
a populations gene frequency
Which of the following observations helped Darwin shape his concept of descent with modification?
a. species diversity declines farther from the equator
b. earthquakes reshape life by causing mass extinction
C) South American temperate plants are more similar to the tropical plants of South America than to the temperate plants of Europe.
D) Fewer species live on islands than on the nearest continents.
E) Birds can be found on islands located farther from the mainland than the birds' maximum nonstop flight distance.
C
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