1. During summer, low water levels cut off gene flow between these two. 2. Gene flow is either absent or greatly restricted among these isolated pockets.3. In this case, divergence is facilitated by the absence of gene flow . 4. However, other authors claimed to have found evidence of such gene flow . 5. Indeed, ongoing gene flow or incomplete lineage sorting is indicated between these populations. 6. Physical barriers to gene flow are usually, but not always, natural. 7. It is not known when gene flow between the subspecies ceased. 8. This may result in gene flow between the two populations because of introgression. 9. Potential effects include gene flow , pesticide resistance and greenhouse gas emissions. 10. The Yenisei River in particular contributed to extensive east-west gene flow .
Mobile