Hardy Weinberg Question

[discowisco]

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Which of the following would cause a population to deviate MOST from Hardy-Weinberg equilibrium?

A The population of individuals becomes geographically isolated from another population.
B The population of individuals is very large and mating happens at random.
C A bottleneck kills 30% of the population at random.
D Homozygous recessive individuals are more vulnerable to predators due to their phenotype preventing proper camouflaging

So I eliminated B since that is a part of the HW principles. And I know both A and C effect HW, but the correct answer is D.

Can anyone explain me exactly how D deviates MOST as opposed to A and C?

 

[FeinMS]

A. there should be no gene flow
C. since the death is at random, it does not pose any selective pressure
D. it presents a selective pressure that disfavors homozygote recessive organisms. This will not result in an "equilibrium"

 

[FuzzyMemory]

A is a requirement, not a cause of disruption for HWE, in that there should be no emigration/immigration into or out of a population

The keyword in B and C is random. If you kill 30% at random, then the proportion of alleles p and q stay the same.

D is the correct answer in that selective pressure quickly decrease one of the alleles in favour of the other.

 

[Romz]

I got D too for the same reason.


A --> Geographic isolation = No exchange/ change in the genetic pool of the population in question.

C--> Death is random, random is good.

B--> Lol

 

[tdod]

Which of the following would cause a population to deviate MOST from Hardy-Weinberg equilibrium?

A The population of individuals becomes geographically isolated from another population.
B The population of individuals is very large and mating happens at random.
C A bottleneck kills 30% of the population at random.
D Homozygous recessive individuals are more vulnerable to predators due to their phenotype preventing proper camouflaging

So I eliminated B since that is a part of the HW principles. And I know both A and C effect HW, but the correct answer is D.

Can anyone explain me exactly how D deviates MOST as opposed to A and C?

A would only cause deviation if the geographic isolation resulted in one of the 2 populations being in a different environment (i.e. from a desert to a forest); for instance, if a massive earthquake causes a fissure that splits a population of gophers in 2, then neither population would deviate b/c they would still be in the same environment.

C Would only cause deviation if the 30% reduction was large enough to cause genetic drift; it the population was already large, then the 30% reduction would likely do nothing.


D, by definition, would cause deviation.

 

[ar00n]

A would only cause deviation if the geographic isolation resulted in one of the 2 populations being in a different environment (i.e. from a desert to a forest); for instance, if a massive earthquake causes a fissure that splits a population of gophers in 2, then neither population would deviate b/c they would still be in the same environment.

C Would only cause deviation if the 30% reduction was large enough to cause genetic drift; it the population was already large, then the 30% reduction would likely do nothing.


D, by definition, would cause deviation.

I agree completely. Nearly picked B but reasoned that D is better since, as you said, 30% won't cause significant genetic drift.