Stories – mostly science
Evolution Lab (PBS)
The Drunkard’s Walk (Genetic Drift: Andrew Hendry)
Brush up your maths
Myths and Misconceptions
This is a page for an optional paper offered in the third semester for students of the M.Sc. final year in Botany at the University of Delhi. It is a highly compressed, essentially introductory course (as, in our infinite wisdom, we do not offer a paper in evolutionary biology for undergraduates in Botany).
After a couple of introductory classes where we discuss morphological variation, both infraspecific (including ecotypes) and interspecific, as well as molecular variation, we then move on to talk about what adaptation is and is not.
We get into some elementary population genetics — genetic drift, population structure, inbreeding, mutation and migration; modes and models of selection, frequency dependent selection, then “hum through” topics such as frequency dependent selection, sexual selection, kin selection, life-history evolution and levels of selection. We briefly peek into quantitative genetics and discuss molecular evolution over a couple of sessions.
Then it is time for speciation, a phenomenally important process that allows the passage from micro- to macroevolution.
After a brief review of phylogenetic trees, reading and telling trees, we go into some basics of doing phylogenetic analysis, and then try to understand phylogenetic biology–or, at least, as it works in the origin of evolution of land plants.
Laboratory sessions include the analysis of morphological and molecular variation; a simulation board game to understand selection; a couple of sessions on PopG to understand the behaviour of genes in populations across several generations; back to phenotypes to study morphological variation among a group of taxa (usually genera of Solanaceae), to construct a morphological data matrix and conduct phylogenetic analysis using maximum parsimony; then to molecular data from the same taxa to estimate phylogenies using neighbor-joining and maximum likelihood methods. We do an exercise on comparative methods and spend one session studying seed plant fossils.
Students do an independent project during the first 6 weeks or so, when they study an assigned plant and present their findings in a poster session. Ph.D. students of the Department of Botany judge these posters.
Dr. Mark Olson, UNAM, Mexico, gave a lecture on structures and adaptations that essentially set the stage for the rest of the semester.
Dr Sudipto Chatterjee, TERI University, came to the annual poster session put up by students of the course.
Drs. Julieta Rosell and Mark Olson of UNAM, Mexico, taught an intensive course for masters and Ph.D. students. The course, “The fate of carbon in forests: a functional traits approach,” involved gathering empirical data (North Delhi Ridge), a crash (micro-) course in R followed by analysis of the data and discussion. The Department of Botany sponsored this course.