Examples of Microevolution in Real Life

📚 Quick Study Guide

• 🧬 Microevolution is defined as changes in allele frequencies within a population or species over a relatively short period of time.
• 🦠 These changes can be caused by several factors, including:
  • Mutation: A change in the DNA sequence.
  • Gene Flow: The movement of genes between populations.
  • Genetic Drift: Random changes in allele frequencies.
  • Natural Selection: Differential survival and reproduction based on heritable traits.
• 🌡️ Antibiotic resistance in bacteria is a classic example of microevolution. Bacteria with genes that provide resistance to antibiotics survive and reproduce more than bacteria without these genes when exposed to antibiotics.
• 🦋 Industrial melanism in peppered moths showed how pollution led to a shift in the population from light-colored moths to dark-colored moths due to increased camouflage against soot-covered trees.
• 🍎 Darwin's finches on the Galapagos Islands demonstrate adaptive radiation, where different populations evolved different beak shapes to exploit different food sources.

Practice Quiz

1. Which of the following is the BEST definition of microevolution?
   1. A) The evolution of entirely new species over millions of years.
   2. B) Small-scale changes in allele frequencies within a population.
   3. C) The development of complex organs.
   4. D) The extinction of species due to environmental changes.
2. Antibiotic resistance in bacteria is an example of microevolution driven by:
   1. A) Genetic drift.
   2. B) Natural selection.
   3. C) Mutation alone.
   4. D) Gene flow alone.
3. Industrial melanism in peppered moths demonstrates which evolutionary process?
   1. A) Convergent evolution.
   2. B) Adaptive radiation.
   3. C) Natural selection.
   4. D) Genetic drift.
4. What is a key characteristic of microevolutionary changes?
   1. A) They always lead to speciation.
   2. B) They occur over long geological timescales.
   3. C) They occur within a relatively short period of time.
   4. D) They only affect physical traits.
5. Which factor does NOT directly contribute to microevolution?
   1. A) Mutation.
   2. B) Gene flow.
   3. C) Genetic drift.
   4. D) Continental drift.
6. Darwin's finches are a good example of:
   1. A) Punctuated equilibrium.
   2. B) Adaptive radiation.
   3. C) Co-evolution.
   4. D) Mass extinction.
7. If a population of insects becomes resistant to a pesticide over several generations, this is an example of:
   1. A) Macroevolution.
   2. B) Microevolution.
   3. C) Stasis.
   4. D) Extinction.