Biology 1002B Lecture Notes - Lecture 19: Spotted Skunk, Reproductive Isolation, Speciation
9 Apr 2016
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Starting macroevolution, no longer a single population, broad scale. Luca continues to evolve, but without no speciation there would only be evolved. Luca, instead of the ten"s of thousands of species we see today. What you see, do they look alike. Phenotypic traits, organism looks more like a certain group of species more than another group. Problem: sexual dimorphism; males can look entirely different from females due to their flashy features to attract mates. Species = interbreeding (or potentially interbreeding) group of individuals, reproductively isolated from other such group. Species don"t necessarily have to look alike, there may be a lot of phenotypic variation. Problem: sometimes species hybridize, mix species and asexual species: ex. Lions and tigers in a zoo or lab (outside of their natural habitat, under pressure) may mate and create ligers (liger"s are sterile). Still two separate species, offspring are an evolutionary dead end: ex.
