Board Thread:Naruto Discussions/@comment-26135923-20150707130017/@comment-5936871-20150712041842

Chaosattractor wrote: And how would they get that, or is bijuu chakra also now genetic? Considering that even after Shukaku was removed from Gaara, he still had Shukaku's chakra in his body. Means that it's possible for it to be passed on, especially since parent's pass their chakra on to their kids. Naruto was also born with his whiskers due to Kurama's influence, since Kushina was Kurama's jin while pregnant with him. Both of Naruto's kids, Boruto and Himawari, also have whiskers, however they have two of them instead of three. This makes me believe that they may have been born as Pseudo-Jinchuriki of Kurama and possibly a very small portion of chakra from the other beasts.

Also, if a transmigrant's chakra can be passed on to someone else via DNA transfusions (Madara implemented Hashirama's flesh into his wounds and received Asura's chakra). Is it really that hard to believe that Naruto, Himawari, and Sarada inherited some of Asura, Indra, and possibly Hagoromo and Hamura's chakra via their parents? Since we know that they inherit their parent's chakra and Hagoromo's chakra is clearly a permanent thing that is now apart of Naruto and Sasuke? Just like how Asura and Indra's chakra is? I don't know that much about genetics, but I'm pretty sure that a child would inherit more of their parents genes than a person who merged some of their parent's flesh with a wound on their chest.

This is the source of theories that started forum threads like this one.