Khan Academy
Khan Academy: Natural Selection in Populations
How natural selection works at the level of genes, alleles, genotypes, & phenotypes.
CK-12 Foundation
Ck 12: Biology: Natural Selection
[Free Registration/Login may be required to access all resource tools.] Describes how natural selection changes allele frequency.
Other
Evolution: The Theory of Natural Selection (Part 1)
These pages are part of a site called Evolution that accompany a textbook by the same name. Mark Ridley is the author. This section has an advanced discussion of determining allele and genotype frequencies using the Hardy-Weinberg ratio.
CK-12 Foundation
Ck 12: Life Science: Evolution Acts on the Phenotype
[Free Registration/Login may be required to access all resource tools.] Natural selection acts on the phenotype (traits or characteristics) of an individual. On the other hand, natural selection does not act on the underlying genotype...
Mocomi & Anibrain Digital Technologies
Mocomi: The Theory of Evolution
This slideshow provides a brief overview of Charles Darwin and his theory of evolution, natural selection and survival of the fittest.
University of Hamburg
University of Hamburg: Deviations From Mendelian Laws And: What Is the Meaning of Dominance?
Upper level discussion of several of Mendel's experiments and laws.
Other
Evidence for Evolution: Formation of New Species
These pages are part of a site called Evolution that accompanies a textbook by the same name. Mark Ridley is the author. These pages offer an explanation of speciation using reproductive isolation and differences in phenotype.
Other
North Dakota State Univ.: Mendel's Law of Ind. Assort.
Mendel's second law and how he arrived at it through his experiments. Includes vocabulary and examples.