 
<translate> Tasirin kwalban yana faruwa ne lokacin da yawan jama'a ya ragu sosai ba zato ba tsammani. Za'a iya rage bambancin kwayoyin halitta ta hanyar jigilar kwayoyin halitta na bazuwar, matsalolin yawan jama'a, tasirin mai kafa. Za'a iya rage bambancin kwayoyin halitta lokacin da yawan jama'a ya zama ƙarami. Amsar ita ce (F). <eng> Bottleneck effect occurs when a population suddenly gets much smaller. Genetic variation can be reduced by random genetic drift, population bottlenecks, founder effect. Genetic variation can be reduced when a population suddenly gets much smaller.
So, the answer is (F). 