Final answer:
Affected sib-pair analysis is a nonparametric linkage method used in genetics research to identify regions of the genome linked to a specific condition or disease.
Step-by-step explanation:
A nonparametric linkage method is Affected sib-pair analysis. This method involves studying families where two siblings are affected by a certain condition or disease. By comparing the frequencies of shared genetic markers between affected siblings and unaffected individuals, researchers can identify regions of the genome that are likely linked to the condition.