Evolution Mock Tests

Adaptive radiation is best illustrated by:

The following passage is an excerpt from an article about evolutionary biology. Darwin's theory of natural selection rests upon several observable facts and their logical consequences. First, populations produce more offspring than the environment can support, leading to a struggle for existence. Second, individuals within a population exhibit variable traits, many of which are heritable. Third, individuals with traits better suited to their environment are more likely to survive and reproduce, thereby passing those advantageous traits to the next generation. Over successive generations, this differential survival and reproduction results in the gradual accumulation of favorable characteristics within the population. However, natural selection acts only on existing variation; it cannot generate new traits on demand. New genetic variation arises through random mutations and recombination, which provide the raw material upon which selection operates. Furthermore, natural selection does not lead to perfect organisms, as environmental conditions change, trade-offs exist between different traits, and genetic drift may counteract selective pressures. According to the passage, why does natural selection not produce perfectly adapted organisms?

Genetic drift is most pronounced in:

According to the Hardy-Weinberg principle, allele frequencies in a population remain constant from generation to generation under certain conditions. Which of the following would NOT violate the Hardy-Weinberg equilibrium:

Adaptive radiation is best illustrated by which example?

Hardy-Weinberg equilibrium states that allele frequencies remain constant when there is no:

A population of 1,000 individuals is in Hardy-Weinberg equilibrium. If the frequency of the recessive allele (q) is 0.4, how many individuals are expected to be heterozygous:

Hardy-Weinberg equilibrium states that allele and gene frequencies in a population remain constant from generation to generation. Which of the following would NOT disrupt this equilibrium?