5.03 Forces of Evolution

Time to Reflect

This has been and exciting first day on the H.M. S. Beagle! We have learned so much about the Galapagos Islands that I can hardly wait to get there. We should be arriving in the morning. Lets’ review to prepare for our excursion tomorrow.

  We have discussed 4 forces that bring about evolution in species.

• Mutations, genetic mistakes that create new alleles.
• Gene flow, mating with closely associated species adds new genes to the gene pool.
• Genetic Drift, drastic changes, or isolation can cause the gene pool to shift.
• Natural selection, individuals with helpful adaptations have more offspring and these genes become more common in the population.

Prepare for the assessment by completing the review activity.

Text Version

Tour Debrief

You have completed this activity if you have:

• added the new terms and their meanings to your Module 5 Glossary Sheet