Fair enough! If you can easily get the DNA profile of Kamala Harris, then do so. Case closed. 
My impression is, a major reason she was chosen as VP running mate is because she would appeal to Black American voters because of her Black African ancestry. I'm just questioning how much Black African ancestry does she really have, in percentage terms.
It's purely a matter of general interest for me. I'm not involved in US politics, but I do place value on accurate facts.
I found the following statement in Wikipedia.
"Donald Harris claims to be descended from slaveowner Hamilton Brown, the namesake of Brown's Town, a claim Snopes rated as unproven."
https://en.wikipedia.org/wiki/Donald_J._Harris
Biden does not need any help with the Black vote; he's a Democrats. Plus, Black Americans largely rejected Harris in the primary. Now the Biden campaign may have picked her for this, but the primary shows it wont really help him with this demographic.
To be honest, I think this pick does him more harm then good, but when you eliminate 98% of your options purely over Woke politics, this is the choice you are forced to make. But rest assure, she has so many issues with her.
Most obvious, if she is such a great choice, why was she polling at 1% support before she dropped out of the primary? She was a distant 4th in her home state, which is more then likely why she dropped out, to avoid the embarrassment of losing in her state.
Not to mention, there some very reasonable questions any serious reporter will ask, like, "you are now running with Joe Biden, who just a few months ago you publicly called a rapist. Do you still believe he is a rapist, and if not, what has changed your mind?"
"You are now running with Joe Biden, whom you implied several times is a racist through his lack of support of bussing and public praise of former KKK members. Not to mention, since then, he has made some rather disparaging remarks about the black community in general. Do you still feel he is a racist, and if not, why?"
"It is well known that you started your career by having an affair with your boss, Willie Brown, who handed you several politically beneficial appointments. He even campaigned on your behalf. In the era of #MeToo, what kind of message does this send to girls and young women in general?" (No doubt this attack will be portrayed as sexist, but it isn't, it's a legitimate critique that will go a long way with certain type of women.)
There are several other things too, such as she is consistently ranked as one of the most liberal senators in congress, and last year was said to be more so than Bernie and Warren. Although this may appeal to progressives, her top cop stance is not something they appear to be okay with overlooking. Then, those voters whom would be fine with a top cop dont like her progressive policies (such as universal health care, the Green New deal, mandatory gun confiscation (buy backs, but that is what it is), support for abortion up until birth, etc).
With over 50% of Dems believe Biden wont finish his first term, Harris is the one with the target on her back, and it is an easy target. Easier then Trump? Who knows, but she is not anywhere near a great choice.