4 Written questions
2 Matching questions
- greatest diversity of species
A. tropical rain forest
C. arctic tundra
D. temperate grassland
- which of the following is true about secondary consumers in an ecosystem?
A. they eat only plants
B. they are eaten by primary consumers
C. they are smaller and weaker than primary consumers
D. they are fewer in number than primary consumers
E. they contain the greatest total biomass
- a A
- b D
5 Multiple choice questions
5 True/False questions
which of the following statements best describes the effect of a genetic drift on the gene frequencies of a population?
A. genes enter a population through immigration, thus changing gene frequencies
B. genes leave a population through emigration, tus changing gene frequencies
C. chance alone can cause significant changes in gene frequencies of small populations
D. Mutations over time cause gene frequencies to change → C
if a population that contains 16% homozygous recessive individuals(blue eyes)and 84% individuals with brown eyes (homozygous dominant and heterozygotes), what is the frequency of the dominant allele in the population?
E. 0.8 → A
some varieties of the bacteria, neisseria gonorrhoeae, are now resistant to penicillin, these varieties of bacteria most probably developed as a result of...
B. hybrid vigor
D. adaptive radiation
E. convergent evolution → A
fossils of some intermediate forms have not been found because
A. new types of organisms can appear suddenly without progressive changes determined by natural selection
B. fossils are very rare; fossils of only a small fraction of species have been found
C. all fossils are the same age
D. species produced by punctuated equilibrium do not leave fossils
E. the ages of many fossils are not calculated correctly → A
A LARGE POPULATION OF LAB AANIMALS HAS BEEN ALLOWED TO BREED RANDOMLY FOR A NUMBER OF GENERATIONS. AFTER SEVERAL GENERATIONS, 49% OF THE ANIMALS DISPLAY A RECESSIVE TRAIT aa THE SAME PERCENTAGE AS AT THE BEGGINING OF THE BREEDING PROGRAM. THE REST OF THE ANIMALS SHOW THE DOMINANT PHENOTYPE, WITH HETEROZYGOTES INDISTINGUISHABLE FROM THE HOMOZYGOUS DOMINANTS.
what proportion of the population is probably heterozygous Aa for this trait?
E. 0.21 → B