Conflict between Cliff's AP Bio and Destroyer Bio #31

[Lazerous]

#31) Which statement is NOT an assumption for Hardy-Weinberg equilibrium?
A) No isolation
B) No net migration
C) No natural selection
D) No mutation
E) All are assumptions

Initially I chose A because I recall reading in Cliff's AP Bio (page 134) that the population must be isolated from other populations (to prevent gene flow) in order to achieve equilibrium.

BUT destroyer says the correct answer is E and states in the solution that "NO isolation" is one of the criteria for H-W equilibrium.


Who is right?

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[drgreen]

So the destroyer is referring to isolation of individuals from a population from another part of the population while AP is referring to isolation of one population from another.

 

[Lazerous]

So the destroyer is referring to isolation of individuals from a population from another part of the population while AP is referring to isolation of one population from another.

I see what you are saying but even in the explanation of Destroyer they say, "This law examines population gene pools, not genotypes of individuals."
Then after that they go on to saying one of the criteria is 'no isolation.'

 

[Lazerous]

So had I chosen 'No isolation' on the real DAT I would have gotten it wrong?

 

[ashlander]

i am confused about this one too.
can anyone clarify this?
this one is #51 for 2009 edition.
I still think the answer should be A. no isolation
thanx.

 

[Neil45]

I'm gonna have to say the answer is "A" as well.

 

[sleepinxlionhar]

Same here, I do wonder about the "correctness" of destroyer at times..

 

[nze82]

#31) Which statement is NOT an assumption for Hardy-Weinberg equilibrium?
A) No isolation
B) No net migration
C) No natural selection
D) No mutation
E) All are assumptions

Initially I chose A because I recall reading in Cliff's AP Bio (page 134) that the population must be isolated from other populations (to prevent gene flow) in order to achieve equilibrium.

BUT destroyer says the correct answer is E and states in the solution that "NO isolation" is one of the criteria for H-W equilibrium.


Who is right?

I might be wrong! But here's how I see this. I think when they say "No Isolation" they're referring to something like the "Founder Effect: When a small sub-population get's separated/isolated from the original population and eventually gives rise to an independent population, which is extremely susceptible to Genetic Drift due to its small size." Because this small population is susceptible to genetic drift, gene frequencies can fluctuate dramatically (No stable equilibrium). So, for Hardy-Weinberg to stand true, we must not have any isolation of this form.

 

[GiTsticker]

I think when they say "No Isolation" they're referring to something like the "Founder Effect...

This is what I was thinking as well. Destroyer puts this question into context in another problem before it; (which one varies on your version of destroyer.)

 

[ttran9229]

#31) Which statement is NOT an assumption for Hardy-Weinberg equilibrium?
A) No isolation
B) No net migration
C) No natural selection
D) No mutation
E) All are assumptions

Initially I chose A because I recall reading in Cliff's AP Bio (page 134) that the population must be isolated from other populations (to prevent gene flow) in order to achieve equilibrium.

BUT destroyer says the correct answer is E and states in the solution that "NO isolation" is one of the criteria for H-W equilibrium.


Who is right?

I would have to agree with Destroyer. If you ask yourself, what happens when there is isolation (remembering that HW principles apply to large populations). The isolation will give rise to many factors that affect the gene pool including, but not limited to, selective mating and unequal gene reproducibility.

 

[miedvied]

[[Deleted post, since I apparently double posted. Accident, sorry.]]

 

[miedvied]

#31) Which statement is NOT an assumption for Hardy-Weinberg equilibrium?
A) No isolation
B) No net migration
C) No natural selection
D) No mutation
E) All are assumptions

Initially I chose A because I recall reading in Cliff's AP Bio (page 134) that the population must be isolated from other populations (to prevent gene flow) in order to achieve equilibrium.

BUT destroyer says the correct answer is E and states in the solution that "NO isolation" is one of the criteria for H-W equilibrium.


Who is right?

Isolation of any sort will foster non-random reproduction by creating an effectively non-infinite breeding population. It doesn't matter whether you're isolating one person or a sub-population: if I cut a few people into a separate group, I've effectively shrunk both the parent group (from X to X-Y) and the removed group (to size Y). Both of these populations will become smaller - aka retreating from infinite size.

Any non-infinite breeding population suffers from genetic drift, which is a statistical sampling error arising in non-infinite populations, and therefore cannot be properly modeled by HWE. By increasing a populations non-infinite character, one increases genetic drift - even if the "isolation" is for one person, it will affect the parent populace.

No isolation is absolutely an assumption of HWE, and E the answer. Destroyer's on the money, here.

Part of the problem is that your interpretation of A is actually a mirror of B. You recall Cliff's saying "isolation from other populations," which is correct, but you got caught up on the word and missed that the answer B is "no net migration." Answer B is "isolation from other populations." Your misinterpretation is eminently reasonable; the catch is that anyone that's taken EvoBio in the relatively recent past will know that list of four on sight. They just took for granted that you had the list a little more freshly ingrained in your mind.

 

[ZH1988]

#31) Which statement is NOT an assumption for Hardy-Weinberg equilibrium?
A) No isolation
B) No net migration
C) No natural selection
D) No mutation
E) All are assumptions

Initially I chose A because I recall reading in Cliff's AP Bio (page 134) that the population must be isolated from other populations (to prevent gene flow) in order to achieve equilibrium.

BUT destroyer says the correct answer is E and states in the solution that "NO isolation" is one of the criteria for H-W equilibrium.


Who is right?

The answer is E
if you have Kaplan BB open page 182 and they have all 4 choices as criteria for the H-W equilibrium

 

[Emmie]

If isolation is NOT an assumption for Hardy-Weinberg equilibrium, that would imply that genetic drift is allowed.

 

[ZH1988]

If isolation is NOT an assumption for Hardy-Weinberg equilibrium, that would imply that genetic drift is allowed.

i thought genetic drift only occurs in small populations, right?