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Illustrates a trait (given by the colour blue) which shows increased similarity between partners, either directly (through mate choice) or due to confounding factors such as shared geography, cultural or religious status or socioeconomic measures. Subsequently, this trait may also undergo postmating convergence, which could be due to direct causal influence from one partner on the other (that is, through imitation or influence) or due to confounding factors such as shared environment.

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