Quick Bio Question

[Phenotype]

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Which of the following is not an assumption of Hardy-Weinberg Eq.?

a) no isolation
b) no net migration
c) no natural selection
d) no mutation
e) all are assumptions


answer was E

1) Not understanding why no isolation is an assumption. Shouldn't a gene population be isolated so that there is no migration? such as barrier isolation.

2) When it says "net" migration is it saying migration is acceptable if they don't disrupt the equilibrium?

This question was from Destroyer #94 for reference.

Also, what is given for the science section.

Periodic Table, Equation Sheet, Calculator (on screen), and white board ?

Thanks in advance !

 

[Impulse155]

Im pretty sure that there are 5 principles for Hardy Weinberg Eq to exist.
1) No Migration
2) No Mutations
3) A population thats large, mainly an infinite population.
4) No Natural Selection
5) Random Mating

So now the question is, why is "no isolation" a principle.
You can say that if you isolate part of the population you are contributing to the migration of part of the population. This would deviate away from the HW Eq.
You can also say that if you isolate 2 members of a population (male and female) You are contributing to the stoppage of random mating.

Lastly you can say that if you isolate a particular group you are also cutting down the population

Thats how I would look at it.

Also to answer your second question, if any migration occurs it will effect Hardy Weinberg Equilibirum and contribute to a deviation from it.

Hope this helps, if not post wher eyour still confused

 

[chromosome21]

Which of the following is not an assumption of Hardy-Weinberg Eq.?

a) no isolation
b) no net migration
c) no natural selection
d) no mutation
e) all are assumptions


answer was E

1) Not understanding why no isolation is an assumption. Shouldn't a gene population be isolated so that there is no migration? such as barrier isolation.
I think Barron's AP mentions that the population must be isolated so there shouldn't be any migration. But I think here, they are talking about something else. Isolation, e.g. geographic isolation, would help generate new species. It's like they are the reasons of speciation. So if we have isolation, we'd be creating new species because of natural selection. That way, the original allele frequency of the original population would be lost! May be that's the reason here, No isolation works in favor of hardy-weinburg equilibrium.

2) When it says "net" migration is it saying migration is acceptable if they don't disrupt the equilibrium?
'No net migration' means the # of alleles moved out of the population must get back in to the population, but here, we are talking about the alleles of our original population only. It means, NO new alleles were introduced or NO original alleles were lost. "No migration" means no original alleles were migrated out and no new alleles would be introduced to our population in question.

This question was from Destroyer #94 for reference.

Also, what is given for the science section.

Periodic Table, Equation Sheet, Calculator (on screen), and white board ?
Only Periodioc table for science section
Only calculator for the math section

They'll provide you two laminated sheets and two markers

There is not going to be any equation sheet! You must memorize all the equations. However, they will give you some of the details of constants and stuff.. like they'd give you plank's constant if you needed that in the question. But that'd be provided in the question itself. New window willnot open for this..

if you want to write down the "equations" you memorized, you can write them down on one of the laminated sheets during the first 15 minutes of the tutorial time..

Thanks in advance !

Hope this helps.