BIO SCI 1A Lecture Notes - Lecture 2: Paleozoic, Cambrian Explosion, Radioactive Decay
29 Nov 2016
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Coevolution: species that mutually influence each other"s evolution. Going on for more than 100 million years. Result: flower structures have become incredibly diverse and complex. Birds bees ants flies _ visit flowers to get pollen or nectar. Nectar is a saccharine secretion of plants to attract animals. Birds and others then carry pollen from one flower or plant to another. Result: carriers contribute to genetic diversity of plant population. Some yucca plants pollinated by only one kind of moth. Organisms plants and animals (the latter excepting humans) do not (cid:532)plant(cid:533) or (cid:532)think about(cid:533) or (cid:532)design(cid:533) to be deceptive or attractive or to (cid:532)cheat(cid:533) In some time, plants need death to secure a new generation. Need to reflect genealogical relations, not just similarity in appearance. Goal of taxonomy became: reflect phylogeny (cid:533) tribe source(cid:533) Came up with phylogenic tree: expresses relationships among species. Branches closest to one another represent species most closely related. Panther leo (genus panther; leo lion)
