Board Thread:Boruto Discussions/@comment-1535822-20160507215828/@comment-28575329-20160606081905

Honestly, it's hard to think of a genetic mode of inheritance by which Himawari would have the Byakugan but Boruto wouldn't. It works if the Byakugan is dominant (autosomal or X-linked), but that would mean that Hinata is heterozygous for the trait, which is unlikely since she comes from a pure Hyuga line.