Akar Nusa
A baker mixes flour from three sacks. Later you taste the loaf and say, "Mostly this, a little of that." A region estimate is a bit like that.
The story
Scientists first collect DNA from many people in known places, for example people whose families have long lived in one region. These are reference groups.
Then they look at your DNA, bit by bit, and ask: which reference group does each piece look most like? Count up the pieces and you get a result such as "60 percent Southeast Asian, 25 percent East Asian, 15 percent South Asian".
Important points, in plain words: - The percentages are best guesses, not exact counts. - The names depend on the reference groups the company has. Different companies can give different numbers. - A percentage says "similar to the people living there today". It does not say your ancestor lived there. - Neighbouring regions can look alike, so the line between them is blurry.
Where you can still see it today
The reason mixing shows up in results is real history. Scientists have used DNA to date more than 100 mixing events in the last 4,000 years, many linked to trade, migration and empires. Malaysia sits on one of the busiest crossroads for this.
What DNA can tell, and what it cannot
It can tell which regions your DNA looks most like, and often hints at past mixing.
It cannot give exact places, exact dates or a named group your ancestors "were". The scientists who wrote about this warn that nice, neat labels can hide how connected people are. It also cannot say race, faith or status. See "Why DNA does not prove race, religion or bumiputera status".
