Imat 2021 Question 38

hey, the first two parts are obvious but how can we justify the third one ‘’ the frequency of a recessive allele increases’’ ?
the answer is D

As we know that in directional selection either of the extreme phenotype is selected over other phenotypes causing the allele frequency to shift over time in a particular direction so, this might favor recessive allele and as a result it’s frequency increases over time.

Also, in the question the keyword is could and according to videos Ari made of past paper questions it lies under the category of “is it real” type of problem so even if there’s a minute chance of the event happening it might happen so, row 5 do makes sense.
Hope it helps:)


thank you for your clear explanation