High school / IB / pre-med level questions covering allopatric, sympatric, parapatric and peripatric speciation; gene flow, drift, selection, mutation; prezygotic vs postzygotic isolation; hybrid zones, reinforcement, ring species, and common concept traps about what counts as a species.
Which statement best captures what must happen for speciation to be considered complete (using the biological species concept)?
Source: entermedschool.org
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src="https://entermedschool.org/embed/questions#{"title":"Speciation & Reproductive Isolation","questions":[{"prompt":"Which statement best captures what must happen for speciation to be considered complete (using the biological species concept)?","options":[{"label":"A","body":"Individuals develop different-looking body shapes","isCorrect":false},{"label":"B","body":"Two populations show any allele frequency differences","isCorrect":false},{"label":"C","body":"Gene flow between populations is effectively prevented by reproductive isolation","isCorrect":true},{"label":"D","body":"Populations become geographically separated for at least 1 million years","isCorrect":false},{"label":"E","body":"A mutation occurs in one population","isCorrect":false}],"explanation":"Under the biological species concept, speciation is complete when reproductive isolation prevents significant gene flow. Appearance differences or time alone are not sufficient, and mutation/evolution can occur without producing new species."},{"prompt":"Two populations of the same bird species become separated by a new mountain range. Over time they diverge genetically. This is most directly an example of:","options":[{"label":"A","body":"Sympatric speciation","isCorrect":false},{"label":"B","body":"Allopatric speciation","isCorrect":true},{"label":"C","body":"Parapatric speciation","isCorrect":false},{"label":"D","body":"Artificial selection","isCorrect":false},{"label":"E","body":"Horizontal gene transfer","isCorrect":false}],"explanation":"Allopatric speciation involves geographic separation that reduces gene flow, allowing divergence by selection/drift/mutation."},{"prompt":"Which scenario best fits sympatric speciation?","options":[{"label":"A","body":"A river splits one population into two isolated groups","isCorrect":false},{"label":"B","body":"A storm carries a few individuals to a distant island","isCorrect":false},{"label":"C","body":"A plant population produces a polyploid lineage that can reproduce with itself but not with the original diploids","isCorrect":true},{"label":"D","body":"Two populations separated by a glacier diverge","isCorrect":false},{"label":"E","body":"Two populations meet and merge back into one gene pool","isCorrect":false}],"explanation":"Sympatric speciation occurs without geographic separation. Polyploidy can create instant reproductive isolation in plants, producing a new species in the same area."},{"prompt":"Two populations live in adjacent habitats along a long coastline. Individuals mostly mate with nearby neighbors, and a stable hybrid zone exists where the habitats meet. This pattern best describes:","options":[{"label":"A","body":"Allopatric speciation","isCorrect":false},{"label":"B","body":"Parapatric speciation","isCorrect":true},{"label":"C","body":"Sympatric speciation","isCorrect":false},{"label":"D","body":"Clonal reproduction","isCorrect":false},{"label":"E","body":"Artificial speciation by selective breeding","isCorrect":false}],"explanation":"Parapatric speciation involves neighboring populations with limited gene flow across a boundary; hybrid zones and clines are common features."},{"prompt":"A small group colonizes a new island and becomes isolated from the original mainland population. If speciation occurs, this is most often classified as:","options":[{"label":"A","body":"Sympatric speciation","isCorrect":false},{"label":"B","body":"Peripatric speciation (a form of allopatric with a small founder population)","isCorrect":true},{"label":"C","body":"Parapatric speciation","isCorrect":false},{"label":"D","body":"Hybrid speciation without isolation","isCorrect":false},{"label":"E","body":"No speciation because islands prevent evolution","isCorrect":false}],"explanation":"Peripatric speciation is a form of allopatric speciation where a small peripheral/founder population becomes isolated. Drift and selection can act strongly because population size is small."},{"prompt":"Which statement best describes gene flow's effect on speciation?","options":[{"label":"A","body":"Gene flow always speeds up speciation by creating new mutations","isCorrect":false},{"label":"B","body":"Gene flow tends to reduce divergence between populations, often opposing speciation","isCorrect":true},{"label":"C","body":"Gene flow is the same thing as genetic drift","isCorrect":false},{"label":"D","body":"Gene flow only happens in asexual species","isCorrect":false},{"label":"E","body":"Gene flow prevents natural selection from acting","isCorrect":false}],"explanation":"Gene flow mixes alleles between populations, making them more similar. This can slow or prevent speciation unless other forces (strong selection, barriers) overcome it."},{"prompt":"Which is a prezygotic reproductive isolating mechanism?","options":[{"label":"A","body":"Hybrid sterility (e.g., mule)","isCorrect":false},{"label":"B","body":"Hybrid breakdown in F2 generation","isCorrect":false},{"label":"C","body":"Different mating seasons (temporal isolation)","isCorrect":true},{"label":"D","body":"Embryo dies early after fertilization","isCorrect":false},{"label":"E","body":"Hybrid has reduced survival after birth","isCorrect":false}],"explanation":"Prezygotic barriers prevent fertilization from occurring (before a zygote forms). Temporal isolation prevents mating because populations breed at different times."},{"prompt":"Which is a postzygotic reproductive isolating mechanism?","options":[{"label":"A","body":"Different courtship rituals","isCorrect":false},{"label":"B","body":"Different habitats within the same area","isCorrect":false},{"label":"C","body":"Incompatible reproductive structures preventing mating","isCorrect":false},{"label":"D","body":"Gametes cannot fuse (gametic isolation)","isCorrect":false},{"label":"E","body":"Hybrids are viable but sterile","isCorrect":true}],"explanation":"Postzygotic barriers act after fertilization. Sterile hybrids (reduced fertility) can survive but cannot produce fertile offspring, stopping gene flow."},{"prompt":"Two closely related frog species live in the same pond. One breeds in early spring; the other breeds in midsummer. This is best described as:","options":[{"label":"A","body":"Mechanical isolation","isCorrect":false},{"label":"B","body":"Temporal isolation","isCorrect":true},{"label":"C","body":"Gametic isolation","isCorrect":false},{"label":"D","body":"Hybrid breakdown","isCorrect":false},{"label":"E","body":"Bottleneck effect","isCorrect":false}],"explanation":"Temporal isolation is a prezygotic barrier where populations breed at different times, preventing mating even in the same location."},{"prompt":"Two insect species court using different pheromones. Individuals rarely attempt to mate across species because they do not recognize each other as mates. This is:","options":[{"label":"A","body":"Behavioral isolation (prezygotic)","isCorrect":true},{"label":"B","body":"Hybrid inviability (postzygotic)","isCorrect":false},{"label":"C","body":"Polyploidy (sympatric)","isCorrect":false},{"label":"D","body":"Bottleneck effect (drift)","isCorrect":false},{"label":"E","body":"Gene flow (migration)","isCorrect":false}],"explanation":"Behavioral isolation is prezygotic: differences in courtship signals prevent mating attempts and reduce gene flow."},{"prompt":"Two snail species have opposite shell-coiling directions, making mating physically difficult. Which barrier is this?","options":[{"label":"A","body":"Mechanical isolation","isCorrect":true},{"label":"B","body":"Gametic isolation","isCorrect":false},{"label":"C","body":"Hybrid breakdown","isCorrect":false},{"label":"D","body":"Temporal isolation","isCorrect":false},{"label":"E","body":"Adaptive radiation","isCorrect":false}],"explanation":"Mechanical isolation is prezygotic: anatomical differences prevent successful mating or pollen transfer."},{"prompt":"Two sea urchin species release gametes into the water at the same time and place, but fertilization between species almost never occurs because sperm cannot bind to the egg surface proteins. This is:","options":[{"label":"A","body":"Habitat isolation","isCorrect":false},{"label":"B","body":"Gametic isolation","isCorrect":true},{"label":"C","body":"Hybrid sterility","isCorrect":false},{"label":"D","body":"Temporal isolation","isCorrect":false},{"label":"E","body":"Founder effect","isCorrect":false}],"explanation":"Gametic isolation is prezygotic: sperm and egg (or pollen and ovule) cannot fuse or interact properly, preventing fertilization even when mating/release overlaps."},{"prompt":"Which situation best illustrates habitat isolation (a prezygotic barrier)?","options":[{"label":"A","body":"Hybrids die before reaching adulthood","isCorrect":false},{"label":"B","body":"Two populations live in the same region but breed in different microhabitats (e.g., one in shallow water, one in deep water)","isCorrect":true},{"label":"C","body":"Hybrids are sterile","isCorrect":false},{"label":"D","body":"A hurricane reduces population size drastically","isCorrect":false},{"label":"E","body":"Chromosome number doubles in a plant","isCorrect":false}],"explanation":"Habitat isolation occurs when populations occupy different habitats in the same area and rarely encounter each other for mating, preventing zygote formation."},{"prompt":"Two bird populations look different and sing different songs. However, when brought together in captivity, they mate readily and produce fertile offspring. Under the biological species concept, they are best considered:","options":[{"label":"A","body":"Definitely different species because they look different","isCorrect":false},{"label":"B","body":"Different species because they sing different songs","isCorrect":false},{"label":"C","body":"The same species because they can interbreed and produce fertile offspring","isCorrect":true},{"label":"D","body":"Different species because captivity always creates new species","isCorrect":false},{"label":"E","body":"Impossible to classify without counting chromosomes","isCorrect":false}],"explanation":"The biological species concept focuses on reproductive compatibility and fertile offspring. Differences in appearance/song may be early divergence but do not necessarily mean full speciation."},{"prompt":"Which statement best distinguishes genetic drift from natural selection?","options":[{"label":"A","body":"Genetic drift is nonrandom and always adaptive","isCorrect":false},{"label":"B","body":"Natural selection is random changes in allele frequencies","isCorrect":false},{"label":"C","body":"Genetic drift is random change in allele frequencies; natural selection is nonrandom change based on fitness differences","isCorrect":true},{"label":"D","body":"Natural selection occurs only in small populations; drift only in large populations","isCorrect":false},{"label":"E","body":"Drift requires mutation; selection does not","isCorrect":false}],"explanation":"Drift is random sampling of alleles (strongest in small populations). Natural selection systematically favors alleles that increase reproductive success in a given environment."},{"prompt":"A sudden disaster reduces a population from 10,000 to 200 individuals. The surviving allele frequencies differ from the original purely by chance. This is best described as:","options":[{"label":"A","body":"Founder effect","isCorrect":false},{"label":"B","body":"Bottleneck effect (genetic drift)","isCorrect":true},{"label":"C","body":"Reinforcement","isCorrect":false},{"label":"D","body":"Assortative mating","isCorrect":false},{"label":"E","body":"Gene flow","isCorrect":false}],"explanation":"A bottleneck is drift caused by a drastic population size reduction. It can reduce genetic variation and change allele frequencies by chance."},{"prompt":"Which statement about the founder effect is most accurate?","options":[{"label":"A","body":"It is a type of natural selection that always improves adaptation","isCorrect":false},{"label":"B","body":"It is genetic drift when a small group starts a new population, potentially with unrepresentative allele frequencies","isCorrect":true},{"label":"C","body":"It is gene flow between populations","isCorrect":false},{"label":"D","body":"It occurs only in plants due to polyploidy","isCorrect":false},{"label":"E","body":"It prevents evolution from occurring","isCorrect":false}],"explanation":"Founder effect is drift caused by colonization by a small number of individuals. The new population's gene pool may differ simply by chance from the source population."},{"prompt":"A key reason drift can accelerate divergence (and potentially speciation) in small isolated populations is that small populations:","options":[{"label":"A","body":"Have more directed mutations","isCorrect":false},{"label":"B","body":"Experience stronger sampling error, so allele frequencies can change rapidly by chance","isCorrect":true},{"label":"C","body":"Always have higher fitness than large populations","isCorrect":false},{"label":"D","body":"Cannot experience natural selection","isCorrect":false},{"label":"E","body":"Have no gene flow by definition, even when they migrate","isCorrect":false}],"explanation":"In small populations, random sampling effects are stronger, causing larger random allele-frequency shifts. If gene flow is low, these differences can accumulate between populations."},{"prompt":"Mutation is best described as:","options":[{"label":"A","body":"A directed change that happens because an organism needs it","isCorrect":false},{"label":"B","body":"A random change in DNA sequence that can introduce new alleles","isCorrect":true},{"label":"C","body":"The process of sorting chromosomes during meiosis","isCorrect":false},{"label":"D","body":"Always harmful and always removed immediately","isCorrect":false},{"label":"E","body":"The same as genetic drift","isCorrect":false}],"explanation":"Mutations arise without regard to what is beneficial; they create new alleles. Whether they spread depends on selection, drift, and gene flow."},{"prompt":"Which statement about natural selection and speciation is most accurate?","options":[{"label":"A","body":"Natural selection always creates new species quickly","isCorrect":false},{"label":"B","body":"Natural selection can contribute to divergence, but reproductive isolation is needed for speciation","isCorrect":true},{"label":"C","body":"Natural selection cannot act unless populations are geographically separated","isCorrect":false},{"label":"D","body":"Natural selection is random, so it cannot cause consistent divergence","isCorrect":false},{"label":"E","body":"Natural selection prevents any hybrid zones from forming","isCorrect":false}],"explanation":"Selection can drive populations to adapt differently, but speciation requires barriers that reduce gene flow (pre- or postzygotic)."}]}"
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