Evolution – Darwinian & Modern Synthetic Theory, Speciation & Human Evolution Quiz - ICSE Class 12 Biology

Free practice quiz: Evolution – Darwinian & Modern Synthetic Theory, Speciation & Human Evolution (ICSE Class 12 Biology). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 12 Biology practice quiz has 51 multiple-choice questions on Evolution – Darwinian & Modern Synthetic Theory, Speciation & Human Evolution, and 51 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is NOT considered a core tenet of Darwinian evolutionary theory?

   1. Variation exists within populations.
   2. Organisms with advantageous traits are more likely to survive and reproduce.
   3. Evolution proceeds through Lamarckian inheritance of acquired characteristics.
   4. Overproduction of offspring leads to a struggle for existence.
   Show answer

   Answer: C. Evolution proceeds through Lamarckian inheritance of acquired characteristics.

   Darwinian theory emphasizes natural selection acting on pre-existing heritable variations. Lamarckian inheritance, the inheritance of acquired characteristics, was a competing theory that Darwin's work largely refuted.

2. The gradual accumulation of differences in allele frequencies between a population and its ancestors, due to evolutionary forces, is known as:

   1. Genetic recombination
   2. Hybridization
   3. Phylogenetic divergence
   4. Adaptive radiation
   Show answer

   Answer: C. Phylogenetic divergence

   Phylogenetic divergence refers to the process by which populations or species evolve separately over time, accumulating genetic differences that can eventually lead to the formation of new species. Genetic recombination is a mechanism within a population, hybridization is the interbreeding of different species, and adaptive radiation is a pattern of diversification.

3. The theory of gradualism in evolution posits that:

   1. Evolution occurs through long periods of stasis punctuated by rapid bursts of change.
   2. Evolutionary change happens slowly and continuously over long periods.
   3. Major evolutionary changes occur due to large genetic mutations.
   4. Species diversity is primarily driven by catastrophic events.
   Show answer

   Answer: B. Evolutionary change happens slowly and continuously over long periods.

   Gradualism, as proposed by Darwin, suggests that evolutionary change is a slow, steady accumulation of small modifications over vast stretches of time, leading to the divergence of species.

4. The molecular clock hypothesis suggests that:

   1. Evolutionary rates are highly variable and unpredictable.
   2. The rate of evolutionary change can be estimated by examining genetic differences.
   3. Fossil evidence is the most reliable indicator of evolutionary time.
   4. Speciation events are always preceded by major environmental shifts.
   Show answer

   Answer: B. The rate of evolutionary change can be estimated by examining genetic differences.

   The molecular clock hypothesis posits that the rate of accumulation of neutral mutations in DNA or protein sequences is roughly constant over time, allowing scientists to estimate divergence times between species by comparing their genetic sequences.

5. The concept of 'genetic load' refers to:

   1. The total number of genes in a population.
   2. The proportion of homozygous dominant individuals in a population.
   3. The reduction in fitness caused by the accumulation of deleterious mutations.
   4. The rate at which new beneficial mutations arise.
   Show answer

   Answer: C. The reduction in fitness caused by the accumulation of deleterious mutations.

   Genetic load is the average decrease in fitness of a population as a consequence of the presence of deleterious mutations. It represents the burden of harmful alleles within a gene pool.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The Modern Synthetic Theory of Evolution integrates Darwinian concepts with which of the following fields?
2. Speciation, the process by which new biological species arise, is primarily driven by:
3. Allopatric speciation occurs when populations are separated by:
4. Which mechanism of evolution is most likely to lead to the fixation of neutral mutations in a population, particularly in small populations?
5. The study of fossil records and their sequence in geological strata provides evidence for:
6. A bottleneck effect, a form of genetic drift, occurs when:
7. Which of the following is an example of sympatric speciation?
8. The concept of 'fitness' in Darwinian evolution refers to:
9. Which type of mutation is most likely to introduce novel genetic variation that can be acted upon by natural selection?
10. The fossil hominin *Australopithecus afarensis*, famously represented by the 'Lucy' skeleton, is significant because:
11. Which of the following is a key adaptation that allowed early hominins to survive in diverse environments and eventually led to the evolution of *Homo sapiens*?
12. The 'Out of Africa' hypothesis, regarding human evolution, suggests that:
13. The discovery of *Homo neanderthalensis* fossils primarily in Europe and West Asia supports which aspect of their evolutionary history?
14. A polyploid organism that can reproduce with itself but cannot interbreed with the diploid parent species is an example of which type of speciation?
15. The Hardy-Weinberg principle describes a theoretical condition where allele and genotype frequencies in a population remain constant from generation to generation. Deviation from these conditions indicates:
16. Which of the following scenarios best illustrates stabilizing selection?
17. The founder effect is a specific type of genetic drift that occurs when:
18. Which of the following is considered a pre-zygotic isolating mechanism?
19. What is the primary difference between macroevolution and microevolution?
20. Which fossil species is considered a potential transitional form between earlier hominins and the genus *Homo*, characterized by a slight increase in cranial capacity and more sophisticated stone tools?
21. The concept of gene flow is important in evolution because it:
22. Which of the following is a key characteristic of disruptive selection?
23. Artificial selection, as practiced by humans, is analogous to natural selection in that both processes:
24. The theory of Punctuated Equilibrium, proposed by Niles Eldredge and Stephen Jay Gould, suggests that evolution is characterized by:
25. Which of the following hominin species is associated with the development of more complex tools, such as the Acheulean handaxe, and a significant increase in brain size, suggesting advanced cognitive abilities?
26. The concept of a 'ring species' is an example of:
27. Genetic drift is most likely to cause significant changes in allele frequencies in:
28. Which of the following is a post-zygotic isolating mechanism?
29. The discovery of *Homo floresiensis* challenges certain assumptions about human evolution because of its:
30. The genetic variation in a population is the raw material for evolution. Which process directly generates new alleles?
31. Sexual selection, as proposed by Darwin, is a form of natural selection where traits that enhance reproductive success, even if they reduce survival, are favored. An example of this is:
32. Which of the following is NOT a key component of the Modern Synthetic Theory of Evolution?
33. The observation that many different species of Darwin's finches on the Galapagos Islands evolved distinct beak shapes suited to different food sources is a classic example of:
34. What is the primary difference in the definition of a species according to the Biological Species Concept versus the Morphological Species Concept?
35. The widespread dispersal of *Homo erectus* from Africa to Asia and Europe suggests:
36. Which of the following is an example of mimicry that could be a product of natural selection?
37. Which of the following hominin species is most closely related to modern humans (*Homo sapiens*) based on current genetic and fossil evidence?
38. The persistence of the sickle-cell trait in some African populations, where heterozygotes (*HbA HbS*) have a survival advantage against malaria, is an example of:
39. Which type of speciation is characterized by the development of reproductive isolation between populations that are continuous geographically but have limited gene flow due to divergence in mate choice or other behavioral factors?
40. The co-evolution of flowering plants and their pollinators is a strong example of:
41. The presence of vestigial organs, such as the human appendix or the pelvic bones in whales, provides evidence for evolution by:
42. Which of the following hominin species shows evidence of burying their dead, suggesting complex social behavior and possibly symbolic thought?
43. The concept of 'punctuated equilibrium' suggests that evolutionary change is not always gradual but can occur rapidly during speciation events. This would be most evident in the fossil record as:
44. Which of the following is an example of a post-zygotic barrier to gene flow?
45. The discovery of the Denisovans, known primarily from genetic evidence extracted from fossilized remains, indicates:
46. According to the Modern Synthetic Theory, what is the primary role of mutation in evolution?

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