IB Biology HL 4.1.12 Types of selection Question Bank

Similarity:

a. both result in a change in allele frequency (within a population)

OR

both do not favour / select against the mean/intermediate (phenotype)

OR

both occur in response to environmental changes/pressures

OR

both can result in new species;

Difference:

b.

directional favours & disruptive favours

one side of mean & both sides of mean

OR &

one extreme & both extremes

OR &

one phenotype & two phenotypes
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a. Do not accept natural selection as it is in the question.

b. Answer should include both distinguishing statements to gain the mark.