is a waste product of plants. Like pseudogenes, introns (in general) evolve faster than coding portions of a gene. In other words, they have speciated. For example, bluegill sunfish have two male morphs. Balancing selection is only rarely found in natural populations. This also corroborates with geological evidence. There has been considerable confusion about the theory. Given the time frames for a single mutant to fix, it is unclear if populations are ever at equilibrium.
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However, evolution and common golden images 41 essays on silent film stars descent are considered fact by the scientific community. Significant amounts of linkage disequilibrium have been found at these loci, indicating that they may all be hitchhiking on some allele under selection. The Modern fauna includes fish, bivalves, gastropods and crabs. Warmbloodedness allows an increase in the vigor of movements in erect organisms. One modification that may have been a key to their success was the evolution of an upright stance. For example, South America had a very distinct marsupial mammalian fauna until the land bridge formed between North and South America. Cambridge, Mass.: Harvard Belknap.