4 evolution questions

hello! i wanted to ask all in one thread as they are all related to the same topic. so sorry for my doodling on the questions
can someone explain these in short? i know the main ideas but got confused in some terminology.
answer: B
answer: B
answer: B


Q3) antibiotics don’t cause mutation, however, over time bacteria that already have random mutations for antibiotic resistance will be favored, and the overall population will resist antibiotics
So B is a better fit than A.

Q14) geographical isolation does not have as only outcome one species evolving into two. For example in parapetric or peripatric isolation, one species becomes two, but they still have a hybird zone and gene flow, they could potentially undergo fusion (reproductive barriers weaken and two species become one)
with genetic isolation, you can’t form hybrids, or only sterile hybrids, so the species will undergo reinforcement (hybrids are less fit and species continue to diverge until two distinct species are formed)

Q20) option C) and D) are analogous features (different origins but serve a same function)
option B) is homologous, one same feature (back leg) evolves to have different functions
option A) is not homologous, the bird leg is it’s back leg, the dolphin flipper is it’s front leg
here they are comparing two completely different structures

idk for Q27), would love to see what other people’s reasoning is!

for q27 I checked from chat gpt for an explanation

and here is the answer it gave me. confusing question for sure.
thanks for answering the other questions

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Q27:According to natural selection, nature selects those who are better fit in the enviornment.In short nature selects for fitness.
Natural selection changes the gene pool according to the situation.
option D is incorrect because it has no direct effect on mutation rate
option C is also incorrect because it can in no way improve the adaptation of any species it just simply select better fitting species.
Option A is a bit confusing but the Gene pool of a population tends to remain stable if the population is large, without large scale mutations, without migration and with random mating.
And natural selection cannot control mutations and migration patterns
Hence, B is the correct option

Btw which book is this ?

thanks for the explanation.
but the question asks for the wrong answer, which one it doesn’t fit for natural selection. in this case if natural selection changes the gene pool, wouldn’t it be right? the reason I answered D was that it has no control over the mutation rate, hence the wrong option.
so shouldn’t it be D?
the book is redspot biology 1000 mcq :slight_smile: