All the world has less genetic variation, than that between any two populations in Africa. Sampling one African population is a start, in that it nearly doubles the DNA sample space for study. But it won't help all of Africa - just the one population sampled.
And I guess the biggest problem is not so much getting samples for the DNA, but rather to link it to phenotype data. And that will be highly country-specific.
I guess this is just a flight of poesy, but it seems like a literally impossible statement.
I don't know if that's true, but it's true that Africans have more genetic variation than anyone else on Earth.
http://www.nbcnews.com/id/30502963/ns/technology_and_science...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4067985/
> most genetic variation in non-African populations is a subset of the variation found in African populations
https://www.ashg.org/education/pdf/geneticvariation.pdf
> Larger Genetic Differences Within Africans Than Between Africans and Eurasians
https://blogs.scientificamerican.com/observations/africa-is-...
https://en.wikipedia.org/wiki/File:World_map_of_prehistoric_...
I thought the correct assertion was that there is greater diversity in Africa itself than occurs in the world outside Africa.
What you wrote could be fooled by choosing two very proximal populations within Africa, thereby failing to take advantage of that diversity.
Nigeria has numerous ethnic groups present in it; but yes, I hope they range further afield as well.