Our learning objective was that students should be able to understand evolutionary mechanisms by presenting the link between DNA mutation and speciation.
We expect that this modification and addition should improve students' comprehension of the entire process involving these evolutionary mechanisms by presenting the link between DNA mutation and speciation.
The other is that the relationship between mutation rates and speciation is the other way round, because a higher speciation rate causes natural selection to preserve more of the mutations that arise, even though the mutation rate itself has not changed.The researchers eliminated the first possibility by selecting particularly common species for their study.
Because τ is the product of the mutation rate, μ, and speciation time, T (τ = μT), variation in τ across chromosomes can be explained by variability in T and/or μ.
Results of tests before and after the students' experiment suggest that this new protocol enhances their understanding of the linkages between mutation, natural selection, and speciation.
These, too, showed more tropical than temperate mutations.By a process of elimination, therefore, the three researchers were left with the conclusion that, by pushing metabolic rates up, tropical heat causes more mutation and thus more speciation.
Geographic Variation, Speciation and Clines explores the origins and development of geographic variation, divergence, and speciation.
We found that the variability of τ among the chromosomes can be explained solely by mutation rates, thus indicating a single speciation time between human and chimpanzee.
Furthermore, the most recent version of the "course of study" for high school biology in Japan (Ministry of Education, Science, Sports and Culture 2009) requires that the process by which mutations and natural selection lead to speciation is taught.
