Free Evolution MCQs with Answers
814 Evolution MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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Read the Evolution notesFree MDCAT chapter notes with key terms814 questions · page 29 of 41
- A. I and II
- B. II and III
- C. I and III
- D. III and IV
- E. II and IV
Explanation: Statements 1 and 2 are incorrect because the members of biological communities do not share a common gene pool; if the environment…
Correct answer: III and IV562. According to Hardy-Weinberg theorem, the sum of recessive and dominant gene frequencies is equal to:
- A. Gene pool of the the trait in the population
- B. Population density
- C. Total number of heterozygotes
- D. Total number of homozygotes
Explanation: The gene pool is the collection of all the characters in one place. They combine together to form a pool so the sum of recessive and…
Correct answer: Gene pool of the the trait in the population- A. Polymorphism
- B. Gene linkage
- C. Specialization
- D. Replication
Explanation: Specialization is the adaptation of an organism or organ to a special function or environment i.e a niche.
Correct answer: Specialization- A. 100
- B. 50
- C. 40
- D. 0
Explanation: Fitness simply means reproductive success so if an individual does not reproduce the degree of fitness would be zero.
Correct answer: 0- A. Wing of an insect, wing of a bird
- B. Leg of a dog, leg of a spider
- C. The arm of a human, the wing of a bats
- D. All of these options are correct
Explanation: Wings of birds, and human hands are examples of homologous organs.
Correct answer: The arm of a human, the wing of a bats- A. DNA replicates by semiconservative replication
- B. Cyanobacteria were responsible for semiconservative replication
- C. The early atmosphere was composed of ammonia and methane
- D. Organic molecules can arise from inorganic precursors
Explanation: Miller-Urey experiment demonstrated that organic molecules can arise from inorganic precursors under conditions similar to those believed…
Correct answer: Organic molecules can arise from inorganic precursors- A. Heterozygous
- B. Genetic diversity
- C. Genetic linkage
- D. Homozygous
Explanation: Correct option: D (Inbreeding increases the frequency of homozygous phenotypes)
Correct answer: Homozygous- A. Inheritance of acquired characteristics
- B. Theory of genetic change
- C. Both A and B
- D. None of these
Explanation: The theory of genetic change is false because he implies that all organisms would gradually become complex, and simple organisms disappear.
Correct answer: Theory of genetic change- A. Mutation
- B. Evolution
- C. Migration
- D. Genetic drift
Explanation: Evolution is the process of change in all forms of life over generations.
Correct answer: Evolution- A. Genetic drift
- B. Diversity
- C. Linkage
- D. All of these
Explanation: Genetic drift is the change in frequency of an existing gene variant in the population due to random chance.
Correct answer: Genetic drift- A. Cyanobacteria
- B. Chlamydomonas
- C. Paramecium
- D. Spirochetes
Explanation: The flagella might have arisen through the ingestion of spirochetes, which are spiral-shaped bacteria.
Correct answer: Spirochetes- A. Becomes fast
- B. Slows down
- C. Remains same
- D. None of these
Explanation: As the population gets larger and approaches the environment's carrying capacity, resources become more scarce and the growth rate slows.
Correct answer: Slows down- A. Differential reproduction
- B. Fitness
- C. Evolution
- D. Natural selection
Explanation: The ability to pass on genes is fitness.
Correct answer: Fitness- A. Non vestigial organs
- B. Homologous organs
- C. Analogous organs
- D. Vestigial organs
Explanation: Option D is correct because vestigial organs are anatomical organs that have lost most or all of their original function during the course…
Correct answer: Vestigial organs- A. Distinct differences
- B. Analogous structure
- C. Vestigial organs
- D. Comparative embryology
Explanation: Embryos of the turtle, mouse, and humans show similar features i.e., they show comparative embryology.
Correct answer: Comparative embryology- A. Darwin
- B. Lamarck
- C. Cuvier
- D. Lyell
Explanation: The correct answer is Darwin. Charles Darwin used the 'tree of life' metaphor to describe how species evolve from common ancestors…
Correct answer: Darwin- A. More Offspring
- B. No Offspring
- C. Less Offspring
- D. Same number of offspring
Explanation: According to Darwin's theory of natural selection, individuals with advantageous hereditary traits are more likely to survive…
Correct answer: More Offspring- A. Formation of the endomembrane system
- B. Membrane modification
- C. Second membrane for protochloroplast
- D. The second membrane dissolves
Explanation: The membrane invagination hypothesis describes the process by which the internal membranes of eukaryotic cells, such as the endoplasmic…
Correct answer: The second membrane dissolves- A. Lamarck
- B. Darwin
- C. Linnaeus
- D. Lyell
Explanation: The correct answer is Linnaeus. Carolus Linnaeus believed in the theory of special creation, which suggests that all species were created…
Correct answer: Linnaeus- A. Genetics
- B. Biochemistry
- C. Paleontology
- D. All of these
Explanation: Neo-Darwinism, also known as the Modern Synthesis, is a comprehensive theory of evolution that combines Darwinian selection with Mendelian…
Correct answer: All of these