Isonymy in two Punjabi isolates of India.

Inbreeding coefficients and effective migrants for the immigrant Punjabi Khattri and Arora of Delhi were estimated from isonymous marriages by five methods: sigma qm2, sigma qf2, sigma qm qf, sigma qm2+f and sigma Ie (pair). It was found that the method sigma qmqf gives better estimates as expected by the isonymy method -- sigma Ie (Pair). A higher estimate of the random inbreeding coefficient suggests that Arora is more inbred than Khattri. The lesser number of effective migrants observed for Aroras also points to their relatively isolated nature. The two groups however, behave as one broad endogamous-panmictic unit.