The mechanism of natural selection works, primarily, to change which of the following?
A The genotypes of individual organisms and their expression
B The rate of mutations resulting from external factors
C The distribution of traits in a population over time
D The likelihood that traits of organisms are passed on
Carnivorous plants, such as the Venus fly trap (Dionaea muscipula), like all other green plants, use photosynthesis to meet their energy needs. They consume insects to provide minerals necessary for proper growth other functions. The frequency of the adaptation for carnivorous behavior will be higher for plants in habitats with what characteristic?
A Soil lacking nutrients
B Abundant herbivores
C Little or no rainfall
D Low insect population
For evolution to function, all of the following characteristics of genes are necessary EXCEPT –
A there is variation in genes in a population
B genetic traits are heritable across generations.
C genetic information is stored on chromosomes.
D genes result in traits that provide advantages.
Over a hundred-year period, the use of a certain pesticide to control insects on cotton crops increases steadily. What change would most likely result from this increase?
A Within the population, the amount of cotton fiber produced per plant would shift to be greater.
B The geographic range of insects that feed on cotton would become more restricted.
C New varieties of cotton that produce enzymes similar to the pesticide would evolve.
D The prevalence of pesticide resistance in insects that eat cotton plants would increase.
The claim that a certain species of plants produce ammonia in their roots to counteract the negative effects of acidic soil would be supported by which of the following observations?
A The frequency in the population of individual plants that produce high levels of ammonia in their roots increases with soil acidity.
B As the acidity of the soil increases, the number of individual plants able to survive and reproduce decreases.
C When the plants are grown in soil with a neutral pH, the levels of ammonia in the roots of the plants remains stable over generations.
D When plants that produce high levels of ammonia are crossed with plants that produce low levels, the offspring survive.
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