Since the trait is rare so Individual 3 marrying into the family should not have any disease-associated allele of Gene A.The pedigree is not dominant since #6 is affected but his parents are not. It is not showing any mitochondrial mode ofinheritance since #6 is affected but his mother (#3) is not and neither is any of his siblings. It is not Y linked since#2 is affected but his son (#5) is not, similarly #6 is affected but his dada (#3) and his sibling (#8) is not. SO this