Which one of the following symbols represents mating between relatives in human pedigree analysis?
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In human pedigree analysis, mating between relatives is represented by a double horizontal line connecting a male and a female. This symbol indicates consanguineous mating, which means that the individuals involved share a common ancestor. The double horizontal line represents a marriage or mating relationship, while the vertical lines extending downward from the double line represent their offspring.
Option 2 is the correct answer.