Free Evolution MCQs with Answers

• A. Thomas Malthus
• B. Herbert Spencer
• C. Charles Lyell
• D. Alfred Wallace

Explanation: Malthus argued that human populations grow faster than food supply, and Darwin saw the same pressure in nature: far more offspring are…

• A. the survival of the largest individuals
• B. the differential survival and reproduction of the individuals best suited to their environment
• C. the deliberate breeding of the best plants by farmers
• D. the migration of animals to better habitats

Explanation: What matters is leaving more offspring, not mere survival or size, so the fittest are those whose inherited traits match the environment.

• A. universal survival
• B. genetic uniformity
• C. competition, the struggle for existence
• D. instant formation of new species

Explanation: Overproduction plus limited food and space means only some individuals survive to breed, and which ones depends on their traits.

• A. Charles Darwin
• B. Alfred Wallace
• C. Charles Lyell
• D. Herbert Spencer

Explanation: Spencer, the philosopher, coined the phrase after reading Darwin, and Darwin later adopted it in later editions of the Origin.

• A. human beings
• B. parasites only
• C. the largest individual in the population
• D. the environment

Explanation: Climate, food, predators and disease together decide which variants survive and reproduce.

• A. natural selection favouring camouflaged variants over many generations
• B. the insect stretching its body towards twigs
• C. Lamarck's inner need for safety
• D. pure chance in every individual

Explanation: Birds removed the conspicuous insects generation after generation, leaving the better disguised to breed, until resemblance became…

• A. Lamarck's inheritance of acquired characters
• B. genetics and the study of mutation
• C. the idea of spontaneous generation
• D. the theory of catastrophes

Explanation: Mendel's genetics supplied the missing mechanism of inheritance, and mutation supplied the source of variation, completing what Darwin…

• A. Vatican Academy
• B. French Academy of Sciences
• C. Linnean Society of London
• D. Royal Institution of Edinburgh

Explanation: Lyell and Hooker arranged for both men's work to be presented together at the Linnean Society, establishing their joint priority a year…

• A. Lamarck
• B. Darwin
• C. Mendel
• D. Wallace

Explanation: Charles Darwin proposed the theory of natural selection in 'On the Origin of Species' (1859).

• A. Directional selection
• B. Stabilizing selection
• C. Disruptive selection
• D. Genetic drift

Explanation: Industrial melanism demonstrates directional selection, where the dark phenotype became favored in polluted environments.

• A. Convergent evolution
• B. Divergent evolution
• C. No evolutionary relationship
• D. Analogous functions

Explanation: Homologous structures (same origin, different function) indicate divergent evolution from a common ancestor.

• A. Natural selection
• B. Genetic drift
• C. Gene flow
• D. Mutation

Explanation: The bottleneck effect is genetic drift caused by a drastic reduction in population size, reducing genetic diversity.

• A. Same habitat
• B. Geographic isolation
• C. Polyploidy
• D. Sympatric conditions

Explanation: Allopatric speciation occurs when populations are separated by a geographic barrier, leading to reproductive isolation.

• A. Common ancestry
• B. Convergent evolution
• C. Divergent evolution
• D. Vestigial development

Explanation: Analogous structures (different origin, same function) result from convergent evolution, e.g., wings of bats and insects.

• A. Darwin and Mendel
• B. Lamarck and Darwin
• C. Mendel and Morgan
• D. Watson and Crick

Explanation: The modern evolutionary synthesis combines Darwin's natural selection with Mendelian genetics and population genetics.

• A. Essential for survival
• B. Reduced non-functional remnants
• C. Newly evolved structures
• D. Only found in embryos

Explanation: Vestigial organs (appendix, coccyx) are reduced remnants of structures functional in ancestors.

• A. Increases genetic differences
• B. Decreases genetic differences
• C. Has no effect
• D. Causes speciation

Explanation: Gene flow (migration) decreases genetic differences between populations by exchanging alleles.

• A. Constant slow change
• B. Rapid change followed by stability
• C. No change over time
• D. Only gradual change

Explanation: Eldredge and Gould's punctuated equilibrium proposes long periods of stability interrupted by rapid speciation events.

• A. Inheritance of acquired traits
• B. Use and disuse of organs
• C. Species never change
• D. Evolution occurs through gradual accumulation of adaptation through successive generations

Explanation: Darwin argued that individuals vary, that more are born than can survive, and that those better suited leave more offspring, so favourable…

• A. Traits caused by mutation
• B. Traits inherited from parents
• C. Traits developed by use or disuse
• D. Traits selected by nature

Explanation: Lamarck held that an organ strengthens with use and withers with disuse during an individual's own lifetime, and that this change is then…