/sci/ - Science & Math

>>1127405
Even I wouldn't leave it that late. I covered the majority of my course in 2 days.

The only advice that I can give to you is to really hammer down what the key formulas are, what they're used for, and how you need to interpret the question so that you can find out the values.

To whoever it was that was helping me out with genetics a day ago, thank you so much. I'm fairly positive I passed this unit.

You have no idea how grateful I am. Thank you.

PLEASE help!

bump

>>1124177
Thanks for that.

Please help...

bump

bamp

bump

Thanks for your input, physicists.

Any biologists that can help, please?

Hey guys. I'm having trouble revising for my genetics exam. I'd really appreciate it if somebody could help me.

I'm looking over past exam questions. Here's one that is giving me a lot of trouble:

Body colour is controlled by variation at a single locus in a blowfly species. The D allele confers dark body and the d allele light body. A population cage was initiated with the D and d alleles at equal frequency. The relative fitness of the three genotypes have been measured in the cage and shown to be D/D 1.00, D/d 0.95, d/d 0.90.

(a) Given these relative fitness values for the three genotypes, what will be the expected frequency of the D allele after TWO generations of selection?
(b) What is the expected equilibrium frequency of the D allele?
_____________________

For (a), we know that p = 0.5 and q = 0.5, but we're asked for the frequency of D after 2 generations. We also know the fitness values. To find the frequency after 1 generation, can you just sub in the known values into the formula in the picture? That would give you the expected frequency after the first generation, right? Then we can just use the new values and use the same formula again to get the expected frequency after the second generation?

Also, with the formula, I can see that it's "q1" that we're looking for but, since p and q are at equal frequencies in the beginning, can we just treat "q1" as "p1"?

Sorry if it was a bit longwinded...

>>1120345
Makes sense, thanks.
>>1120349
You don't have to be a smart ass. Like I've said previously, the lecturers are shit and don't provide the help that they should.

Thanks to everybody that did help. I'm going to bed.

>>1120320
Teachers were shit and I had to go inter-state several times during the year because my grandmother recently developed dementia and requires almost constant care.

>>1120301
I've learned a lot in these past 6 hours.

>>1120240
9 and 10

>>1120223
That's grade 9 stuff, bro. :(

>>1120143
Refer to:
>>1119493
Here's another one for you as well.

In an isolated population of bandicoots there are 30 males and 70 females. Allele frequencies at the X linked E locus were measured. In females the E1 allele frequency was 0.6. In males the E1 allele frequency was 0.3.

What would be the E1 allele frequency if the population was in Hardy Weinberg equilibrium?

bump

bump
>>1119493

>>1119493
Anybody?

>>1119669
Thanks for reading anyway.

>>1119592
I'd write something like that if this guy didn't give partial credit for working out problems. Unfortunately, he does.

It's time for another question!

Body colour is controlled by variation at a single locus in a blowfly species. The D allele confers dark body and the d allele light body. A population cage was initiated with the D and d alleles at equal frequency. The relative fitness of the three genotypes have been measured in the cage and shown to be D/D 1.00, D/d 0.95, d/d 0.90.

(a) Given these relative fitness values for the three genotypes, what will be the expected
frequency of the D allele after TWO generations of selection?

(b) What is the expected equilibrium frequency of the D allele?

>>1119420
Good luck