<p>@satanxiety you have to log into your USABO account and click View Exam Scores under like student corner or something. I have my username in an email from them, and the password is whatever you made it. Or your teacher can access them. There’s no list.</p>
<p>Since the histogram was already posted, I’ll add the following (as per usual):</p>
<p>2014 Semifinalists by State</p>
<p>Alabama - 1 Semifinalist, 1 school
Arkansas - 1 Semifinalist, 1 school
Arizona- 10 Semifinalists, 4 schools
California- 184 Semifinalists, 49 schools
Connecticut - 10 Semifinalists, 9 schools
Delaware- 7 Semifinalists, 2 schools
Florida- 19 Semifinalists, 6 schools
Georgia- 6 Semifinalists, 4 schools
Illinois- 17 Semifinalists, 7 schools
Indiana- 12 Semifinalists, 7 schools
Kansas- 2 Semifinalist, 1 school
Kentucky- 7 Semifinalists, 2 schools
Louisiana- 5 Semifinalists, 1 school
Massachusetts- 12 Semifinalists, 6 schools
Maryland- 11 Semifinalists, 5 schools
Michigan- 21 Semifinalists, 7 schools
Minnesota- 7 Semifinalists, 3 schools
Missouri- 5 Semifinalists, 3 schools
Nebraska- 1 Semifinalist, 1 school
Nevada- 4 Semifinalists, 2 schools
New Hampshire- 5 Semifinalists, 1 school
New Jersey- 85 Semifinalists, 25 schools
New Mexico- 2 Semifinalists, 1 school
New York- 37 Semifinalists, 13 schools
North Carolina- 11 Semifinalists, 3 schools
Ohio- 2 Semifinalists, 2 schools
Oklahoma- 2 Semifinalists, 1 school
Oregon- 5 Semifinalists, 3 schools
Pennsylvania- 30 Semifinalists, 11 schools
Rhode Island- 1 Semifinalist, 1 school
South Carolina- 1 Semifinalist, 1 school
Tennessee- 1 Semifinalist, 1 school
Texas- 58 Semifinalists, 13 schools
Utah- 2 Semifinalists, 1 school
Virginia- 22 Semifinalists, 4 schools
Washington- 9 Semifinalists, 4 schools
West Virginia- 6 Semifinalists, 2 schools
Wisconsin- 1 Semifinalist, 1 school
Hong Kong- 1 Semifinalist, 1 International School
Thailand- 1 Semifinalist, 1 International School
Semifinalists: 624 States: 38 and 2 International Schools
Schools represented: 211 </p>
<p>2014 Open Exam Results
Number of students registered for the Open Exam: 7,766
Score needed to become a Semifinalist: 28.5
Average score (out of a possible 50): 21.18
Highest score: 43.75</p>
<p>2014 Semifinal Exam Results
Number of Semifinalists: 624
Number of schools that were represented: 211
Number of states represented in the Semifinals: 38, 1 US School in Hong Kong
& 1 US School in Thailand </p>
<p>alright thank u both (and yah i logged into my account before i clicked view exam scores). </p>
<p>On the genetics question from the previous page. I’m getting 2 pairs of genes as the answer. I’m getting that the genotypes are AABB and CCDD for the two parental foxes where A and C are codominant and B and D are codominant as (1:2:1)^2 gets the ratio in the problem. I guess there’s some epistaxis thing that makes it a 4 gene linked trait though I can’t seem to find a way to get 1:2:1 using 2 genes given that the parental phenotype only has probability 1/16, since any dominant epistatis seems to get the parental phenotype probability higher than 1/16.</p>
<p>@BeanDelphiki I pretty sure the second part if the solution doesn’t work since if you consider the generating function for 4 genes it’s (A/2+a/2)^2<em>…</em>(D/2+d/2)^2, so any probability that can written as the sum of the coefficients of the above polynomial should be able to work. The binomial expansion formula only works if the generating function is in the form (A/2+a/2)^n which only occurs if you have an n-plaid organism for a single gene.</p>
<p>Does anyone know how a score of 19.0 is for a freshman?? Also, I heard that there was a histogram somewhere, but I can’t seem to find. Might you all have any links for 2014 or 2013??</p>
<p>for the histogram, check an earlier post of mine about 2 pages back. 19 is quite decent, since that is where the average is abouts-- and that’s for freshmen, sophomores, juniors, and seniors!</p>
<p>@RandomGuy - Firstly, I really suck at math in general (especially combinatorics), so you’re probably right (although tbh most of what you said went over my head). </p>
<p>(1:2:1)^2 is reasonable, and each 1:2:1 results from a set of two alleles. I’m wondering if instead of it being two alleles, it’s two genes instead - this would give the correct answer while meeting your specs. Thus, I’m basically pretending that a “pair of genes” is a “pair of alleles”. Then, it’s a quadrihybrid cross, which can give the provided ratio (I think I see what you’re saying with the binomial arg, but I"m treating it as a quadrihybrid cross where alleles are replaced by pairs of genes, so the binomial theorem argument (should?) remain valid). </p>
<p>Lol I completely forgot about USABO because of college apps. Haha when you get likely letters you forget about the rest of your life. Now to send a college update. Just checked my score. Got a 34.75. Lol scored better than my 29, I think, from last year. Studied hard last year and this year didn’t study since last year. That’s variance for ya. But last year I thought I was gonna study Bio hard over the summer to get top 100. Didn’t bc no time. But it looks like I reached my goal. I thought I had prob gotten a 20. Woot. Lol can someone confirm this? Seemed like I saw like 500+ ppl from 28-34 or something. Also, am I in the 34 or 35 column in the graph?</p>
<p>35</p>
<p>Some questions about 2011 semi exam answer key:
7: Answer is D, but I believe this is wrong. rRNA 18s is not in eukaryotes. It should be B, right?
42: I got the answer, but I’m not sure why specifically.
57: Answer key says C. Shouldn’t it be E?
104: Isn’t plesiomorphy synonymous with essential?
105: wat
109: so that means 64/100 are homo-dominant. So number of blue should be (.2)^2 so wouldn’t that make .04? where did .07 come from.
111: key says C, but the % recomb is 25/100 so shouldn’t it be D?
117: how is it both easterly and westerly winds?
Thanks!</p>
<p>Yeah those answer keys definitely have some errors.</p>
<p>Well, for 109, if you calculate the allele frequency of the dominant allele, you get 64*2+20=148 dominant genes, which means the dominant allele frequency (p) = 148/200 = .74. Which means the recessive allele frequency is 1-.74=.26, and the homozygous recessive genotype frequency = (.26)^2 = ~.07.</p>
<p>But, yeah, I think all the other ones are screwed up.</p>
<p>Ah that does make sense, since it’s not in equilibrium.
Also, can anyone explain 105 and 42?</p>
<p>Also, regarding 2012:
73: why would gibberellin increase after removal of the tip?
96: isn’t chloride usually not involved in action potentials?</p>
<p>Finally after struggling 5 months on how to sign up for college confidentials</p>
<p>Sup. At this point yall seeing this are probably semifinalists so kudos to you</p>
<p>I’ve been trying to make camp for a while but it’s not trivial</p>
<p>I’m a soph right now and i got a 38 (few silly mistakes and few correct guesses heh) this year</p>
<p>and I would be pretty darn happy if i make camp this year (I know i’m not making it for other subjects this year so)</p>
<p>I’ve only studied campbell and read it few times (at least 2) and some chapters especially many times </p>
<p>But semifinals are pretty darn hard and a lot of information are tricky, and i don’t even know biotech lol.</p>
<p>If there are any advice i’ll be happy to receive them 
</p>
<p>(oh and i’m not actually a bio god i’m pretty bad at it) </p>
<p>105- the other children aren’t actually unaffected, they just didn’t bother to shade it in because they assume you can tell everyone in that generation is “unknown” -_-
42- …logic? lol
And yeah, I think the other ones are messed up :p</p>
<p>hello basedbiogod!
biotech isnt that difficult dude, first you have to understand PCR, gel runs, and hybridization and then everything is just really an extension/modification on that stuff</p>
<p>idk an advice i’ve gotten is to take as many of the previous semis as possible (along with reading campbell lol)</p>
<p>Thanks unkekkable, i have trouble reading blottings/pcr/plasmid preparation. if there are any good sources or guide for this it would be greatly appreciated!</p>
<p>Also, i’m taking the semis (exponentially decreasing self confidence), but the things i get wrong are often pretty random things and they don’t even repeat much anymore.</p>
<p>How exactly does it help or what practice can i do with the semis to improve my skills? Thanks!</p>
<p>Hi, I am a sophomore this year and am going to take AP biology next year, and want to take USABO next year. </p>
<p>I would like to do some self-studying over the summer for the USABO and to prepare for AP Bio. I have not taken any previous biology courses. I was wondering whether or not it would be effective for me to just read Campbell biology over the summer, given that I have no past experience with biology. If not, there is a summer school class I could take at a nearby school and I was wondering if that would be more effective for someone with no past biology experience?</p>
<p>Thanks!</p>