How may nonrandom mating lead to speciation?

How may nonrandom mating lead to speciation?

• Nonrandom mating or sexual selection occur naturally when the presence of heritable characteristic increases the likelihood of bringing about successful fertilization.
• Traits that lead to more mating for an individual lead to more offspring and through natural selection, eventually lead to a higher frequency of that trait in the population.
• If the gene for the characteristic increase in successive generation a new species may develop.

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