BSC 2010 Lecture Notes - Lecture 20: Zygote, Chromosome, Sympatric Speciation

• School: University of Florida
• Department: Biology - Biological Sciences
• Course: BSC 2010
• Professor: Chen Sixue

Document Summary

Speciation- divergence of a single biological lineage into two distinct lineages: origin of species is via the process of speciation, the split off, have to have some distinct characteristic between the two populations. Morphological species concept: linnaeus (1707-1778) developed the system of binomial nomenclature. Things that look alike are the same species: used for fossils, doesn"t always work. Especially when there"s extreme sexual dimorphism within a species. Larval form looks different from adult form. Cryptic species- 2 or more species that are morphologically indistinguishable but do not interbreed. Biological species concept: species are groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups . Ernst mayr (1951: if you could potentially interbreed with another species, makes you the same species, if they can"t interbreed, they"re different species, reproductive isolation- two groups of organisms can no longer exchange genes.