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When an Animal's Sex Is Set by a Microbe

DNA from a bacterium called Wolbachia seems to control whether pillbugs are male or female.

AN EXAMPLE OF ARTIFICIAL SELECTION FIGURE 1.10 Evolution of Wild Mustard through DomesticationIn artificial selection, humans are the selective agents. The many different varieties of cruciferous plants were created by humans through selective breeding of genetically varied wild mustard plants. Individuals with desired genetic characteristics were bred with each other until their descendants became distinctly different from the ancestor, the wild mustard.