Evolution

Biology, HSSC-KPK Second Year. This chapter is split into 24 topics and has 532 practice questions. The topics covered are listed below, followed by 10 free sample questions from the chapter.

Topics in this chapter

1. Pre-Darwinian Thought and Evolution of Eukaryotes 20 questions
2. Lamarckism 20 questions
3. Darwin's Voyage and Observations 20 questions
4. Darwin-Wallace Theory Features 20 questions
5. Neo-Darwinism and Modern Synthesis 20 questions
6. Evidence from Anatomy and Fossils 20 questions
7. Vestigial, Biochemical, and Embryological Evidence 20 questions
8. Divergent and Convergent Evolution 20 questions
9. Hardy-Weinberg Theorem 20 questions
10. Speciation and Comprehensive Review 20 questions
11. Pre-Darwinian Scientists Dates and Ideas 27 questions
12. Origin of Life Theories and Eukaryote Origin Details 23 questions
13. Lamarckian Mechanism Applications and Criticism 21 questions
14. Darwin Voyage Dates and Finch Adaptations 22 questions
15. Natural Selection Reasoning and Scenarios 24 questions
16. Modern Synthesis Mechanisms and Genetic Drift 24 questions
17. Homology Analogy Fossils and Vestigial Organ Applications 28 questions
18. Embryology Biochemistry and Convergent Examples 23 questions
19. Hardy-Weinberg Allele Frequency Numericals 28 questions
20. Hardy-Weinberg Genotype and Population Counts 26 questions
21. Hardy-Weinberg Conditions Drift and Evolution 23 questions
22. Speciation Mechanisms and Isolation Scenarios 23 questions
23. Evolution Exercise Items and Related Terms 20 questions
24. Hardy-Weinberg Equation Concepts and Genotype Frequencies 20 questions

Sample questions: Evolution

10 sample questions with the correct answer and an explanation. Try to answer each one before reading the explanation.

Q1. In modern-day eukaryotes, which membrane of the mitochondria and chloroplast is more similar to prokaryotes, and which retains eukaryote characteristics?

• A. Both membranes are identical to prokaryotes
• B. The inner membrane resembles prokaryotes, while the outer membrane retains eukaryote characteristics(correct answer)
• C. The outer membrane resembles prokaryotes, while the inner membrane retains eukaryote characteristics
• D. Neither membrane shows any prokaryotic characteristics

Answer: B.The inner membrane resembles prokaryotic structures (from the original invading cell), while the outer membrane, from the host's infolding, retains eukaryotic characteristics.

Q2. A population of insects is repeatedly exposed to a pesticide over several generations, and later generations show increased resistance. If this occurred purely through a Lamarckian mechanism, what would need to be true?

• A. The pesticide itself would need to directly alter the DNA sequence of every insect's offspring randomly
• B. Individual insects would need to develop resistance during their lifetime through exposure, and this acquired resistance would need to be directly passed to offspring(correct answer)
• C. No mechanism at all would be required, since insects cannot evolve resistance
• D. Resistant insects would need to already exist by chance and simply survive and reproduce more

Answer: B.A true Lamarckian mechanism would require lifetime-acquired resistance to be inherited, contrasting with the Darwinian mechanism of selecting pre-existing resistant variants.

Q3. How did Lamarck's proposed mechanism for evolution differ from the later Neo-Darwinian understanding of heredity via DNA and genes?

• A. Lamarck proposed that traits acquired via environmental use/disuse could be passed on directly, while modern genetics shows only changes to germline DNA (not acquired body changes) can be inherited(correct answer)
• B. Neo-Darwinism also relies on inheritance of acquired characters
• C. Lamarck's theory predicted DNA structure before Watson and Crick
• D. Both mechanisms are functionally identical

Answer: A.Lamarck's inheritance-of-acquired-characters idea is incompatible with the modern genetic understanding that only germline DNA changes are heritable.

Q4. When a species moves into a new area, why might its gene pool become markedly different from the parent population?

• A. Because gene pools never change once a species is established
• B. Because individuals in the new area are exposed to different mutations and selective pressures, and drift acts on the smaller founding group(correct answer)
• C. Because the new environment has no effect on gene frequencies
• D. Because all individuals in the new population are genetically identical to the parent population forever

Answer: B.New environments and smaller founding populations expose the moved population to different mutations and drift effects, differentiating their gene pool.

Q5. List the five major causes of evolution accepted by the modern theory (Neo-Darwinism), as covered in the chapter.

• A. Creationism, catastrophism, uniformitarianism, pangenesis, and natural selection
• B. Overproduction, struggle for existence, variation, natural selection, and speciation only
• C. Gene/chromosomal mutation, genetic recombination, natural selection, genetic drift, and reproductive isolation(correct answer)
• D. Endosymbiosis, membrane infolding, mutation, drift, and speciation

Answer: C.The five modern synthesis causes are gene/chromosomal mutation, genetic recombination, natural selection, genetic drift, and reproductive isolation.

Q6. Which of the following is one of the conditions that must be ABSENT for Hardy-Weinberg equilibrium?

• A. Infinite population size
• B. Mutation(correct answer)
• C. Completely random mating
• D. No migration

Answer: B.Mutation must be absent (not present) for equilibrium; the other options listed are actually required conditions for equilibrium, not things that must be absent.

Q7. Why can the frequency of homozygous recessive individuals (q²) usually be determined directly from phenotype observation, unlike homozygous dominant or heterozygous individuals?

• A. Because dominant alleles cannot be observed phenotypically at all
• B. Because recessive alleles are always more common than dominant ones
• C. Because all three genotypes always look completely different from each other
• D. Because homozygous recessive individuals are the only ones who will not show the dominant trait, making them phenotypically distinguishable(correct answer)

Answer: D.Only homozygous recessive individuals lack the dominant phenotype, making them directly identifiable, unlike dominant homozygotes and heterozygotes which look alike.

Q8. Which statement correctly analyses divergent and convergent evolution in light of evidence from comparative anatomy?

• A. Comparative anatomy provides no evidence relevant to either divergent or convergent evolution
• B. Divergent evolution is supported by homologous structures (shared ancestry, different functions), while convergent evolution is supported by analogous structures (different ancestry, similar functions)(correct answer)
• C. Only convergent evolution can be studied through comparative anatomy
• D. Both divergent and convergent evolution are supported by exactly the same type of anatomical evidence

Answer: B.Homologous structures support divergent evolution's common-ancestry argument; analogous structures support convergent evolution's independent-adaptation argument.

Q9. Considering the overall chapter, how do pre-Darwinian ideas (creationism, catastrophism, uniformitarianism), Lamarckism, Darwinism, and Neo-Darwinism represent a historical progression in scientific understanding of biological change?

• A. They trace an evolving scientific framework: from fixed-species views, through early (flawed) mechanisms like use/disuse inheritance, to natural selection, and finally to genetics-based modern synthesis explaining heredity's role in evolution(correct answer)
• B. Each idea is entirely unrelated to the others with no historical connection
• C. Creationism and Neo-Darwinism are identical theories with different names
• D. Lamarckism is the most modern and scientifically accurate of all these theories

Answer: A.The chapter traces a historical arc from fixed-species views through Lamarck's flawed mechanism, to Darwin's natural selection, to the genetics-integrated modern synthesis.

Q10. Which of these finch types is labelled in Fig 24.7?

From your book: Figure 24.7 (page 286) Full page Open book

• A. Hawk finch
• B. Seed finch
• C. Cactus crow
• D. Woodpecker finch(correct answer)

Answer: D.The figure labels large, medium, small and sharp-billed ground finches, cactus, warbler, woodpecker, vegetarian, large tree and small tree finches.