1. Exogamy The fusion of gametes produced by organisms that are not closely related.
（异系配合）：亲缘关系较远的生物体产生的配子相互融合。
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2. Conversely, we may say that, wherever exogamy can be found, we may confidently expect to find, after due investigation, at least traces of a system, of capture.
3. For two millennia, exogamy was a major transgression for Jews. (In many communities, prayers for the dead were recited for a Jew who married a non-Jew. ) As a result, out-marriage was rare.
