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 15 of 41
- A. Reptiles
- B. Fishes
- C. Amphioxus
- D. Amphibians
Explanation: Fossil fishes, the earliest vertebrates, with amphibians next, followed by reptiles, then mammals and birds.
Correct answer: Amphibians- A. Reptiles
- B. Birds
- C. Amphioxus
- D. Amphibians
Explanation: Fossil fishes, are the earliest vertebrates, with amphibians next, followed by reptiles, then mammals and birds.
Correct answer: Birds- A. Cast
- B. Impression
- C. Resin
- D. None of the above
Explanation: Explanation for this question will be added soon
Correct answer: None of the above- A. Hard rocks
- B. Sedimentary rocks
- C. Soft rocks
- D. Ignitions rocks
Explanation: Most fossils are found in sedimentary rocks
Correct answer: Sedimentary rocks- A. Analogous structures
- B. Homologous structures
- C. Vestigial structures
- D. None of the above
Explanation: Homologous structures are similar physical features in organisms that share a common ancestor, but the features serve completely different…
Correct answer: Homologous structures- A. Analogous structures
- B. Homologous structures
- C. Vestigial structures
- D. None of the above
Explanation: Analogous structures are features of different species that are similar in function but not necessarily in structure and which do not…
Correct answer: Analogous structures- A. Analogy
- B. Homology
- C. Anatomy
- D. Paleontology
Explanation: Analogous organs are functionally alike but structurally different e.g. wings of bat, birds and insects etc.
Correct answer: Analogy- A. 0.7
- B. 0.3
- C. 0.5
- D. 0.4
Explanation: A recessive allele is a form of genetic coding that does not produce a phenotype in the presence of a dominant allele.
Correct answer: 0.3- A. 0.64
- B. 0.32
- C. 0.04
- D. 0.44
Explanation: In our model wildflower population, these frequencies are AA=0.64 (64%) (320 out of 500 plants), Aa=0.32 (160/500), and aa = 0.04 (20/500).
Correct answer: 0.32- A. Gene pool
- B. Allelic ratio
- C. Allelic frequency
- D. None of the above
Explanation: A general formula, called the Hardy- Weinberg equation is used for calculating the frequencies of alleles and genotypes in populations at…
Correct answer: Allelic frequency- A. 0.2
- B. 0.8
- C. 1.0
- D. 2.0
Explanation: Note that p+q= 1; the combined frequencies of all possible alleles must account for 100% of the genes for that locus in the population.
Correct answer: 1.0- A. 0.64
- B. 0.32
- C. 0.04
- D. 1.00
Explanation: The frequency of heterozygous individuals in the population is 2pq (2x0.8x0.2=0.32, in our example).
Correct answer: 0.32- A. 0.64
- B. 0.32
- C. 0.04
- D. 1.00
Explanation: The frequency of individuals homozygous for the other allele (aa) is q2 , or 0.2x0.2=0.04
Correct answer: 0.04- A. Genetic drift
- B. Random mating
- C. Selection
- D. Migration
Explanation: Inbreeding is the most common form; it does not alter allele frequency, but lessens the proportion of heterozyote individuals.
Correct answer: Random mating- A. 30%
- B. 44%
- C. 54%
- D. 60%
Explanation: Tropical rain forests, the most threatened areas on the earth, have been reduced to 44% of their original extent.
Correct answer: 44%- A. Pollution
- B. Over population
- C. Habitat destruction
- D. Rain
Explanation: . In recent years, however, the threat to the welfare of wild plants and animals has increased dramatically-mostly as a result of habitat…
Correct answer: Habitat destruction- A. Pollution control
- B. Supply of water
- C. National parks
- D. Breeding
Explanation: A global system of national parks to protect large tracts of land and wildlife corridors that allow movement between natural areas.
Correct answer: National parks- A. High concentration of CO2 in atmosphere
- B. High concentration of O2 in atmosphere
- C. Limited supply of nutrient sources
- D. High temperature in the primitive environment
Explanation: The nutrients produced in the primitive environment would have limited early life., If life were to continue, another source of nutrients…
Correct answer: Limited supply of nutrient sources- A. All living organisms formed from ancestors
- B. All living organisms formed spontaneously
- C. All living organisms formed by divine
- D. None of the above
Explanation: According to the theory of special creation, all living things came into existence in their present forms especially and speciically…
Correct answer: All living organisms formed by divine- A. All living organisms formed from ancestors
- B. All living organisms formed spontaneously
- C. All living organisms formed by divine
- D. None of the above
Explanation: The idea that organisms might evolve through time, with one type of organism giving rise to another type of organism, is an ancient one…
Correct answer: All living organisms formed from ancestors