Board Thread:Theories and Speculation/@comment-30168130-20161223235115/@comment-1512913-20161226104131

Yes, it's true that kekkei genkai is genetic, coming from fancy mutations in the genes and can be harvested from such an individual from his/her cells/flesh... but let's take Sharingan for example. The source is genes, some of these genes make special chakra be created in the brain which then affects the eyes to turn them into Sharingan. But since it's genes which allow this special chakra to exist which in turn transforms the eyes, as shown with Obito and Kakashi, transferring this special brain chakra into an individual is enough to give him/her Sharingan temporarily, without the need of having the genes.

So it is possible to temporarily obtain Kekkei Genkai powers from chakra alone in special circumstances like the Sharingan.