Het gaat om dit stukje tekst: The theory that initially led researchers to test for patterned changes in women’s preferences for certain male characteristics across the reproductive cycle is good genes sexual selection the- ory. In natural populations, variation in heritable fitness (i.e., variation in genetic factors passed from parents to offspring that had different effects on the reproductive success of offspring) accumulates for several reasons. By chance, some individuals have more mutations than others, resulting in differences in fitness. In addition, some genes are not subjected to consistent selection pressures across time. Cell-surface markers and proteins in many organisms, for instance, are subject to selection by pathogens, but some markers and proteins coded by DNA are better able to resist local pathogens than others. Pathogens, however, also evolve in response to these markers and proteins, which permits changes across time in the precise genes that are favored in host popula- tions. These changes generate variation in the ability to resist pathogens at any given point in time (Hamilton, 1980) across host individuals.
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