Some organisms are inherently resistant to an antimicrobial compound or drug due to simply lacking the target site it acts upon or because of an inability for that agent to accumulate to a biologically effective concentration. Intrinsic resistance may occur because of exposure to the…
Introduction Sexual selection is a controversial term due to its definition. Sexual selection can be viewed as an independent type of selection; separate from natural selection. However, others view sexual selection as another form of selection under natural selection. These views originate from the discoverers…
Chimpanzees are a close relative to modern humans. A split in the lineage occurred about 5 to 10 million years ago, which was followed by a series of further splits resulting in the emergence of numerous closely related species along the path to the development…
Selection is frequency-dependent when the fitness of a phenotype, genotype, or gene (or species) varies with its relative abundance in the population (or community) and hence can be detected only when measured at two or more frequencies. In “negative frequency-dependent selection,” fitness decreases with frequency…
The concept of natural selection was first introduced by Charles Darwin and has had an immense impact in all aspects of biology. The idea is that genes that confer a fitness advantage increase in the population while ones that decrease fitness become less common. Natural…
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