本题目来源于试卷: SL/HL Topic D4.1 Natural selection，类别为 IB生物学
[问答题]
b. After 15 generations i;e ;9e7fl rigbn the low-predation steam the offspr8 ip.gbxhuky 6 n/mm,:ing of this population o.6yn/,k:bxh8 guipmm f grey guppies showed much more pigment polymorphism.
Explain how this result demonstrates evolutionary change.
参考答案: Any three of these points for 3 marks:
Evolution by natural selection has occurred over the 15 generations.
The fish with grey colouration had variable spots of colour (there was variation in the population) Bighter coloured fish are more likely to attract a mate.
Bright coloured fish will breed/pass on the characteristic to the next generation more than the less coloured fish. The frequency of alleles for colour has increased in the population over 15 generations.
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