41. Instead, speciation results from the evolution of mechanisms that reduce gene flow between the two populations. 42. New and even homogenizing effects of gene flow . 43. There are a number of factors that affect the rate of gene flow between different populations. 44. Our data suggest that this shift was not accompanied by large amounts of Afroasiatic16 gene flow . 45. A barrier to gene flow exists from South to North as a result of the female preference. 46. It is however possible that restricted gene flow could reduce genetic diversity within populations that become isolated. 47. "We are concerned about gene flow , " said U . S . Agriculture Department spokeswoman Meghan Thomas. 48. That means there is no gene flow , 49. As far as distinct lineages, throughout history, we have had too much gene flow between so-called races. 50. The study result suggests gene flow between Ethiopia and Yemen as a possible explanation for the closeness.
