Evolution Quiz & Flashcards

Gene flow involves the transfer of alleles between populations, increasing genetic diversity, unlike genetic drift, which is random.

Speciation is the process of forming new species, while adaptation and mutation refer to different evolutionary changes.

The human appendix is considered vestigial, as it no longer serves a vital digestive function like it did in ancestors.

Darwin proposed natural selection as the primary mechanism of evolution, where advantageous traits become more common.

An adaptation is a trait that enhances an organism's survival and reproduction, unlike genotype or phenotype which describe genetic and physical attributes.

Artificial selection is driven by human choice for desired traits, unlike natural selection which occurs naturally.

The bottleneck effect reduces population size and genetic diversity due to a significant reduction in individuals.

Stabilizing selection favors average traits, reducing variation, unlike directional or disruptive selection which favor extremes.

A phylogenetic tree shows evolutionary relationships among species, not genetic variation or physical traits.

Convergent evolution describes similar traits in unrelated species due to similar environmental pressures, unlike homologous structures.

The founder effect occurs when a new population is established by a small number of individuals, affecting genetic diversity.

Punctuated equilibrium involves long periods of evolutionary stability interrupted by short, rapid changes.

Genetic drift causes random changes in allele frequencies, especially in small populations, without introducing new genes.

The gene pool is the complete set of genetic information within a population, not individual genetic attributes like genotype.

Allopatric speciation occurs due to geographic isolation, unlike sympatric speciation which occurs without physical barriers.

The fossil record provides evidence of past life forms and evolutionary changes, unlike processes like photosynthesis.

Homologous structures share a common origin, whereas analogous structures do not but serve similar functions.

Gene flow involves allele exchange between populations, unlike genetic drift which is random and mutation which introduces new alleles.

Transitional fossils provide evidence for evolutionary changes by showing intermediary forms between species.

Phenotype plasticity refers to an organism's ability to alter its phenotype in response to environmental changes.

Temporal isolation is a prezygotic mechanism preventing mating due to species breeding at different times.

The Hardy-Weinberg principle describes the genetic makeup of a population that is not evolving.

Batesian mimicry involves a harmless species mimicking a harmful one to avoid predation.

Directional selection favors one extreme trait over others, shifting the population's trait distribution.

Genetic recombination increases genetic variation by shuffling alleles during meiosis, not eliminating mutations.

Punctuated equilibrium suggests rapid changes occur, unlike gradualism which implies slow, continuous change.

Endosymbiotic theory explains how mitochondria and chloroplasts originated from free-living bacteria integrated into other cells.

Disruptive selection increases frequency of extreme phenotypes, unlike stabilizing selection which favors intermediates.

Polyploidy can lead to new species formation in plants due to multiple sets of chromosomes.

Phylogeny describes the evolutionary history of organisms, unlike phenotype which refers to observable traits.

Antibiotic resistance evolves through natural selection, where resistant bacteria survive and reproduce.

Genetic linkage refers to genes located close together on a chromosome that tend to be inherited together.

Coevolution leads to mutual adaptations among interacting species, enhancing their evolutionary paths.

Biogeography studies species distribution, explaining marsupial spread due to historical isolation and adaptive radiation.

Microevolution involves small genetic changes within populations, while macroevolution leads to large-scale changes and new species.

A cladogram illustrates phylogenetic relationships among species, showing evolutionary history rather than age or traits.

Gene flow increases genetic diversity by introducing new alleles, unlike genetic drift or stabilizing selection which can reduce it.

Adaptive radiation describes the rapid increase in species diversity from a common ancestor, unlike convergent evolution.

Convergent evolution leads to similar traits in unrelated species due to similar environmental pressures, unlike genetic drift.

Genetic drift causes random allele frequency changes, more impactful in small populations, unlike gene flow which involves allele transfer.

A common misconception is that evolution creates perfect organisms; it leads to adaptations that are suitable for the environment.

The bottleneck effect reduces genetic variation by drastically reducing population size, unlike mutation which introduces new variations.

The principle of common descent posits that all species share a common ancestor, explaining evolutionary relationships.

Genetic recombination involves the exchange of genetic material during meiosis, increasing genetic diversity.

Hybrid inviability is a postzygotic barrier where hybrid offspring do not develop properly, unlike prezygotic barriers like temporal isolation.

Batesian mimicry involves a harmless species mimicking a harmful one to avoid predation, as seen in the viceroy and monarch butterflies.

Sympatric speciation occurs without geographic isolation, unlike allopatric speciation which requires physical separation.

A molecular clock estimates divergence times by using mutation rates, not measuring physical traits or population sizes.

Stabilizing selection favors average traits, reducing genetic diversity, unlike disruptive selection which favors extremes.