問題詳情

9. An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The surviving population happens tohave broader stripes, on average, than the initial population. If broadness of stripes is genetically determined, what effecthas the ground-squirrel population experienced during the earthquake?
(A) disruptive selection
(B) a genetic bottleneck
(C) directional selection
(D) a founder event
(E) stabilizing selection

參考答案

答案：B
難度：困難0.333333
統計：A(2),B(4),C(2),D(1),E(1)

用户評論

【用戶】菩提

【年級】國三下

【評論內容】Campbell biology 10e p489the bottleneck effectA sudden change in the environment, such as a fire or flood,may "drastically" reduce the size of a population. A severedrop in population size can cause the bottleneck effect(1)瓶頸效應(bottleneck e ffect)：族群受到災害而發生非選擇性死亡，導致族群數量銳減•而存活下來的個體無法代表原來族群的基因組成某些對偶基因可能在存活者中數量過多，其他又過少or完全被除去。the founder effect.When a few individuals become isolated from a larger population,this smaller group may establish a new populationwhose gene pool differs from the source population; this iscall...