The Biology I Course was developed through the Ohio Department of Higher Education OER Innovation Grant. The course is part of the Ohio Transfer Assurance Guides and is also named OSC003. This work was completed and the course was posted in October 2019. For more information about credit transfer between Ohio colleges and universities, please visit: www.ohiohighered.org/transfer.Team LeadCathy Sistilli Eastern Gateway Community CollegeContent ContributorsLisa Aschemeier Northwest State Community CollegeShaun Blevins Rhodes State CollegeRachel Detraz Edison State Community College Sara Finch Sinclair Community CollegeWendy Gagliano Clark State Community College AJ Snow University of Akron Wayne CollegeLibrarianAmanda Rinehart Ohio State UniversityReview TeamJessica Hall Ohio Dominican UniversitySanhita Gupta Kent State UniversityErica Mersfelder Sinclair Community College
People did not understand the mechanisms of inheritance, or genetics, at the time Charles Darwin and Alfred Russel Wallace were developing their idea of natural selection. Scholars rediscovered Mendel’s work in the early twentieth century, and over the next few decades scientists integrated genetics and evolution in what became known as the modern synthesis—the coherent understanding of the relationship between natural selection and genetics that took shape by the 1940s. Natural selection can affect a population’s genetic makeup, and, in turn, this can result in the gradual evolution of populations. In the early twentieth century, biologists in the area of population genetics began to study how selective forces change a population through changes in allele and genotypic frequencies. Adaptive evolution is the process by which natural selection increases the frequency of beneficial alleles in the population, while decreasing the frequency of deleterious alleles.
By the end of this section, you will be able to do the following:
Explain the different ways natural selection can shape populations
Describe how these different forces can lead to different outcomes in terms of the population variation