Comprehensive Pre-med style evolution questions on terminology, natural selection, genetic drift, speciation, and sources of variation
In modern biology, which definition best describes evolution at the population level?
Source: entermedschool.org
<!-- Evolution: Selection, Drift, and Speciation — EnterMedSchool -->
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src="https://entermedschool.org/embed/questions#{"title":"Evolution: Selection, Drift, and Speciation","questions":[{"prompt":"In modern biology, which definition best describes evolution at the population level?","options":[{"label":"A","body":"Change in an individual's traits during its lifetime","isCorrect":false},{"label":"B","body":"Change in the number of individuals in a population over time","isCorrect":false},{"label":"C","body":"Change in allele frequencies in a population across generations","isCorrect":true},{"label":"D","body":"Development of new organs in response to environmental demands","isCorrect":false},{"label":"E","body":"Any change in the DNA of a single individual","isCorrect":false}],"explanation":"Evolution is defined as a heritable change in allele frequencies in a population from one generation to the next."},{"prompt":"What is the gene pool of a population?","options":[{"label":"A","body":"All the genes present in a single individual","isCorrect":false},{"label":"B","body":"All the phenotypes that appear in a population","isCorrect":false},{"label":"C","body":"The total collection of different species that live in a habitat","isCorrect":false},{"label":"D","body":"The total set of all alleles at all loci in all individuals of a population","isCorrect":true},{"label":"E","body":"The subset of alleles that are dominant in a population","isCorrect":false}],"explanation":"The gene pool includes every allele for every gene in all individuals of the population."},{"prompt":"Which statement correctly distinguishes microevolution from macroevolution?","options":[{"label":"A","body":"Microevolution involves changes in single genes, macroevolution involves changes in non-genetic traits only","isCorrect":false},{"label":"B","body":"Microevolution occurs in prokaryotes, macroevolution occurs only in eukaryotes","isCorrect":false},{"label":"C","body":"Microevolution refers to changes in allele frequencies within populations; macroevolution refers to larger-scale patterns such as speciation and extinction","isCorrect":true},{"label":"D","body":"Microevolution occurs by mutation, macroevolution occurs by natural selection","isCorrect":false},{"label":"E","body":"Microevolution is random, macroevolution is directed","isCorrect":false}],"explanation":"Microevolution is small-scale evolution within populations; macroevolution is the accumulation of changes leading to new species and higher taxa."},{"prompt":"Which statement best describes natural selection?","options":[{"label":"A","body":"Random changes in allele frequencies due to chance events","isCorrect":false},{"label":"B","body":"Non-random differential survival and reproduction of individuals with different heritable traits","isCorrect":true},{"label":"C","body":"The ability of individuals to change their traits in response to need","isCorrect":false},{"label":"D","body":"The deliberate breeding of organisms by humans","isCorrect":false},{"label":"E","body":"Random mating between all individuals in a population","isCorrect":false}],"explanation":"Natural selection is a non-random process where individuals with advantageous heritable traits leave more offspring, changing allele frequencies."},{"prompt":"In evolutionary biology, fitness is best defined as:","options":[{"label":"A","body":"The physical strength and health of an individual","isCorrect":false},{"label":"B","body":"The ability of an individual to survive relative to others, regardless of reproduction","isCorrect":false},{"label":"C","body":"The contribution an individual makes to the gene pool of the next generation relative to others","isCorrect":true},{"label":"D","body":"The total number of genes an individual carries","isCorrect":false},{"label":"E","body":"The genetic similarity between parents and offspring","isCorrect":false}],"explanation":"Evolutionary fitness is measured by reproductive success: how many viable, fertile offspring an individual leaves compared with others."},{"prompt":"Which process is the ultimate source of NEW alleles in a population?","options":[{"label":"A","body":"Natural selection","isCorrect":false},{"label":"B","body":"Genetic drift","isCorrect":false},{"label":"C","body":"Gene flow","isCorrect":false},{"label":"D","body":"Mutation","isCorrect":true},{"label":"E","body":"Non-random mating","isCorrect":false}],"explanation":"Mutation creates new alleles; selection, drift, and gene flow only change the frequencies of existing alleles."},{"prompt":"Which of the following is a RANDOM evolutionary process?","options":[{"label":"A","body":"Natural selection favouring a particular phenotype","isCorrect":false},{"label":"B","body":"Non-random mating where females choose certain males","isCorrect":false},{"label":"C","body":"Genetic drift changing allele frequencies after a storm randomly kills individuals","isCorrect":true},{"label":"D","body":"Directionally increased survival of antibiotic-resistant bacteria","isCorrect":false},{"label":"E","body":"Artifical selection by breeders","isCorrect":false}],"explanation":"Genetic drift is change in allele frequencies due to chance events (e.g. random deaths), not due to the traits of individuals."},{"prompt":"Which scenario is the BEST example of genetic drift?","options":[{"label":"A","body":"Predators preferentially catch slower animals, reducing frequency of slow-running alleles","isCorrect":false},{"label":"B","body":"A drought favours plants with deeper roots that access water more effectively","isCorrect":false},{"label":"C","body":"A hurricane randomly kills most individuals in a population, leaving survivors that are not genetically representative of the original population","isCorrect":true},{"label":"D","body":"Farmers repeatedly breed cows that produce more milk","isCorrect":false},{"label":"E","body":"Females prefer males with bright plumage, increasing those alleles","isCorrect":false}],"explanation":"Genetic drift is strongest when random events (like a hurricane) drastically reduce population size regardless of genotype."},{"prompt":"In which situation is genetic drift expected to have the STRONGEST effect on allele frequencies?","options":[{"label":"A","body":"A very large population (millions of individuals)","isCorrect":false},{"label":"B","body":"A small isolated population founded by a few individuals","isCorrect":true},{"label":"C","body":"A population experiencing strong directional selection","isCorrect":false},{"label":"D","body":"A population with extremely high mutation rates","isCorrect":false},{"label":"E","body":"A population with strictly random mating","isCorrect":false}],"explanation":"Drift is most powerful in small populations, especially after founder events or bottlenecks."},{"prompt":"The founder effect is best described as:","options":[{"label":"A","body":"Increased mutation rate in the founding generation","isCorrect":false},{"label":"B","body":"A few individuals establishing a new population whose allele frequencies differ from the original population by chance","isCorrect":true},{"label":"C","body":"Selection for traits that improve colonisation ability","isCorrect":false},{"label":"D","body":"Introduction of new alleles to a population by migration","isCorrect":false},{"label":"E","body":"The first appearance of a new allele by mutation","isCorrect":false}],"explanation":"The founder effect is a type of genetic drift in which a new population founded by a small number of individuals has allele frequencies that are random samples of the source population."},{"prompt":"The bottleneck effect occurs when:","options":[{"label":"A","body":"A population size sharply increases, reducing genetic variation","isCorrect":false},{"label":"B","body":"A large population is dramatically reduced in size, and the surviving gene pool is unrepresentative of the original population","isCorrect":true},{"label":"C","body":"Selection strongly favours individuals at both extremes of a trait","isCorrect":false},{"label":"D","body":"Mutations occur at a single locus","isCorrect":false},{"label":"E","body":"Gene flow is blocked between populations","isCorrect":false}],"explanation":"A bottleneck is a drastic reduction in population size where random survival alters allele frequencies and reduces genetic variation."},{"prompt":"Which is the best example of gene flow?","options":[{"label":"A","body":"Random changes in allele frequencies in a small isolated population","isCorrect":false},{"label":"B","body":"Individuals migrating into a population and successfully breeding with residents","isCorrect":true},{"label":"C","body":"Mutations introducing new alleles within a population","isCorrect":false},{"label":"D","body":"Natural selection eliminating maladaptive alleles within a population","isCorrect":false},{"label":"E","body":"Random mating within a population","isCorrect":false}],"explanation":"Gene flow is the transfer of alleles between populations due to movement of individuals or gametes followed by reproduction."},{"prompt":"Which combination correctly matches evolutionary processes with RANDOM vs NON-RANDOM effects on allele frequencies?","options":[{"label":"A","body":"Mutation (non-random), natural selection (random)","isCorrect":false},{"label":"B","body":"Genetic drift (random), natural selection (non-random)","isCorrect":true},{"label":"C","body":"Gene flow (random), genetic drift (non-random)","isCorrect":false},{"label":"D","body":"Mutation (non-random), genetic drift (non-random)","isCorrect":false},{"label":"E","body":"Natural selection (random), non-random mating (random)","isCorrect":false}],"explanation":"Drift is random with respect to fitness; natural selection is non-random differential success of genotypes."},{"prompt":"Which form of natural selection tends to reduce variation by favouring intermediate phenotypes and selecting against extremes?","options":[{"label":"A","body":"Directional selection","isCorrect":false},{"label":"B","body":"Disruptive selection","isCorrect":false},{"label":"C","body":"Stabilising selection","isCorrect":true},{"label":"D","body":"Balancing selection","isCorrect":false},{"label":"E","body":"Frequency-dependent selection","isCorrect":false}],"explanation":"Stabilising selection trims the extremes and maintains an optimal intermediate phenotype, reducing phenotypic variation."},{"prompt":"In a population of birds, only those with the longest beaks can access a new food source, and they leave significantly more offspring. Over time, the average beak length increases. Which type of selection is this?","options":[{"label":"A","body":"Stabilising selection","isCorrect":false},{"label":"B","body":"Directional selection","isCorrect":true},{"label":"C","body":"Disruptive selection","isCorrect":false},{"label":"D","body":"Balancing selection","isCorrect":false},{"label":"E","body":"Artificial selection","isCorrect":false}],"explanation":"Directional selection favours one extreme phenotype, shifting the population mean in that direction."},{"prompt":"A population of fish lives in a lake with two distinct habitats: dark, vegetated areas and bright, sandy areas. Very light and very dark colour morphs are well camouflaged and survive better, while intermediate-colour fish suffer higher predation. Which type of selection is occurring?","options":[{"label":"A","body":"Directional selection","isCorrect":false},{"label":"B","body":"Stabilising selection","isCorrect":false},{"label":"C","body":"Disruptive selection","isCorrect":true},{"label":"D","body":"Sexual selection","isCorrect":false},{"label":"E","body":"Purifying selection","isCorrect":false}],"explanation":"Disruptive selection favours both extremes over the intermediate phenotype, potentially leading to polymorphism or even speciation."},{"prompt":"What is an adaptation in evolutionary terms?","options":[{"label":"A","body":"Any trait that appeared recently in a lineage","isCorrect":false},{"label":"B","body":"A heritable trait that increases an individual's fitness in a specific environment","isCorrect":true},{"label":"C","body":"Any behavioural response to the environment, whether inherited or learned","isCorrect":false},{"label":"D","body":"A trait that arose only by genetic drift","isCorrect":false},{"label":"E","body":"A trait that an individual acquires during its lifetime through use and disuse","isCorrect":false}],"explanation":"Adaptations are heritable features shaped by natural selection because they increase survival or reproductive success."},{"prompt":"Which situation best illustrates sexual selection rather than natural selection in general?","options":[{"label":"A","body":"Brightly coloured males have reduced survival but attract far more mates","isCorrect":true},{"label":"B","body":"Individuals with thicker fur survive better in cold climates","isCorrect":false},{"label":"C","body":"Individuals with better camouflage are less likely to be eaten","isCorrect":false},{"label":"D","body":"Random storms kill individuals regardless of their traits","isCorrect":false},{"label":"E","body":"Humans breed dogs with certain temperaments","isCorrect":false}],"explanation":"Sexual selection specifically involves traits that increase mating success, even if they reduce survival."},{"prompt":"Kin selection explains the evolution of behaviours that:","options":[{"label":"A","body":"Benefit unrelated members of the population equally","isCorrect":false},{"label":"B","body":"Increase an individual's own survival but never its reproduction","isCorrect":false},{"label":"C","body":"Reduce an individual's direct fitness but increase the reproductive success of relatives sharing its genes","isCorrect":true},{"label":"D","body":"Only occur in species with no parental care","isCorrect":false},{"label":"E","body":"Are entirely random in occurrence","isCorrect":false}],"explanation":"Kin selection favours behaviours that increase inclusive fitness by helping relatives who share many of the same alleles."},{"prompt":"Which statement best describes a species according to the biological species concept?","options":[{"label":"A","body":"A group of organisms that look identical","isCorrect":false},{"label":"B","body":"A group of populations whose members can interbreed in nature and produce viable, fertile offspring","isCorrect":true},{"label":"C","body":"A group of organisms that occupy the same habitat","isCorrect":false},{"label":"D","body":"A group of organisms that share a recent common ancestor","isCorrect":false},{"label":"E","body":"A group of organisms with identical DNA sequences","isCorrect":false}],"explanation":"The biological species concept focuses on reproductive compatibility and gene flow, not just similarity of appearance or shared ancestry."}]}"
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