Here is a short timeline of events from 3,000 BC to 2,000 BC.
Here is a short timeline of events from 2,000 BC to 1,000 BC.
You will note, there was no "interruption" or population "bottleneck" around 2,000 BC.
In fact, there is no scientific evidence at all -- none -- for a world-wide flood or population bottleneck, in 2,000 BC or any other time.
2. Y chromosomes are indeed similar worldwide. No divergent Y lineages have been found. Therefore, evolutionists acknowledge a paternal common ancestor, calling him Y-chromosomal Adam.
3. There are indeed three main mtDNA lineages found worldwide today. Evolutionists have labeled these lines “M”, “N”, and “R”. In a court of law, this would be considered inculpatory evidence.
4. There is little difference between these three mtDNA lineages, so they must have originated in a single female, who lived not long before the bottleneck. (Evolutionists call her Mitochondrial Eve).
5. Since humans have virtually identical DNA, the genetic diversity is consistent with thousands of years, not millions of years.
...
“Large-scale surveys of human genetic variation have reported signatures of recent explosive population growth, notable for an excess of rare genetic variants, suggesting that many mutations arose recently” “We estimate that approximately 73% of all protein-coding SNVs and approximately 86% of SNVs predicted to be deleterious arose in the past 5,000–10,000 years”
http://www.nature.com/nature/journal/v493/n7431/full/nature11690.html
The Y chromosomes in all humans worldwide are very similar, indicating a recent sole male ancestor – matching Noah, and before him, Biblical Adam.
There are three mtDNA lineages, perfectly matching the Bible's record of the three wives on the Ark who repopulated the Earth.
These three mtDNA lineages are very similar, indicating they diverged from a single female ancestor who lived one to two thousand years before the Flood – matching Biblical Eve. Eve's mtDNA would have diverged down through Eve's descendents for roughly 1,500 years (~75 generations), then at the Flood only three lineages were taken onto the Ark.
The life spans of Noah's descendants decrease exponentially – on a graph, it's a biological decay curve. This is expected if creation is true.
Humans have a high mutation rate, passing down over 100 mutations per generation. This is consistent with a human history of thousands, not millions, of years.
If we descended from apes millions of years ago, our DNA would have diverged considerably (1 million years = ~50,000 generations). Since all humans today have virtually identical DNA, evolutionists had to come up with an explanation for this, so a population bottleneck was proposed (actually two, for males and females) where only ONE female's lineage AND ONE male's lineage survived to today, while thousands of other males and females, living at the same time, lineages died out. One lineage dying out is very improbable; BOTH dying out - in an expanding, post-bottleneck population no less - is ridiculously improbable.
http://www.astirinch.com/creation/dna-proof-of-noahs-flood/