The genetic transmission of the capacity to develop an immune response to hapten-polylysine conjugates was studied in guinea pigs.

82 per cent of the 22 offspring of 8 pairs of responder (guinea pigs which are capable of an immune response) parents were also responders, whereas, none of the 26 offspring of 9 pairs of non-responder parents were responders.

None of 11 strain 13 guinea pigs and 100 per cent of 40 strain 2 guinea pigs were responders.

These findings are consistent with the view that the capacity to respond immunologically to hapten-polylysine conjugates is genetically transmitted as a unigenic Mendelian dominant.

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