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Spread the love. Figure 1. Schematic illustration of Gram-positive cell wall. Gram-positive bacteria have a multilayered peptidoglycan layer unlike Gram negative bacteria with a thinner layer of peptidoglycan. Figure 2. Toggle navigation Evolution 4e. Evolutionary biology aims to discover the history of life, the causes of the diversity and characteristics of organisms, and the mechanisms that underlie evolutionary change.
His theory of natural selection as the chief cause of evolution was not broadly supported until the evolutionary synthesis that occurred in the s and s. The major causes of evolution within species are those that change the frequencies of alleles, and hence of the phenotypes they may affect.
Different populations of a species may experience different genetic changes, and ultimately become different species. Over long time periods, many slight changes accumulate to yield large genetic and phenotypic differences among species and their ancient an-cestors.
Evolutionary biology makes important contributions to other biological disciplines and to social concerns in areas such as medicine, agriculture, computer science, and our understanding of ourselves.
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