Correct
单传
/ dānchuán /
Strokes
Definition
to have only one heir in a generation (of a family, clan etc)/to be learned from only one master (of a skill, art etc)
Example
As a Verb
have only one son for several generations in a row
As a Noun
patrilineal succession of descents with only one son in each generation
As a Verb
pass on a skill from one master to a single learner