BIL 150 Lecture Notes - Lecture 3: Character Displacement, Equilibrium Thermodynamics, Broccoli
Document Summary
4 unifying themes of biology (stress the unity of life) 1663: robert hooke discovered first cells in cork. Leeuwenhoek"s microscope: study euglena (organisms that are heterotrophic and photosynthetic) 1670: malphigi suggests plants are made of cells. Finally 1839: schleiden, schwann separately propose cell theory. Pasteur: microbes cannot grow if trapped by u- tube. Cell=smallest unit of life that can perform all functions. All living cells store hereditary info in dna. Double helix splits, forms two templates, two new strands generated. = descent with modification / a change in characteristics of population over time. All species from preexisting species changed through time. Happens when something about environment makes certain traits fit better/worse in that environment. Found character displacement: medium ground finches get deeper beaks due to drought. Ex: many vegetables (broccoli, brussels,) are bred from wild mustard plants. Molecular selection also exists (not just species) Genes located on chromosomes (chromosomal theory of inheritance)
