<p>My sophomore did not take the test since he thinks he can do better the next date - do you know of any practice websites or the Princeton practice books are good enough for a perfect score.</p>
<p>@udiwoodie. What does the percentile ranking have to do with scores? Can you elaborate.</p>
<p>I think the choice was H+ increases, which is why I didn’t put it. Why would it not be a buffer though?</p>
<p>I cant seem to remember the bacteria coming from water question. I also cant seem to remember the H+ increasing decreasing question. Kind of worried now</p>
<p>Also, why isnt the ape skull question brain cavity. Apes do have a smaller brain cavity size.</p>
<p>@xexvc0302 technically it doesn’t mean much. It just shows the general curve pattern given for the 2006 Biology SAT Subject Test. In order to get a 300 you had to be in the 98th percentile. Obviously we don’t know how everyone did but your raw score must be in the 98th percentile to receive an 800. It seems based on the forum that the 98th percentile for this test will be about a raw score of 77 so you can have 3 omits or 2 questions wrong with one 1 omit or 1 question wrong with 2 omits to receive an 800. This is all speculation but its pretty accurate.</p>
<p>Also for the 250 year old forest problem, the rate at which the other three trees decrease allows us to predict that those three tree types will almost be gone. but the rate at which beech increases rises very quickly over the other trees and we can predict that it is the most common. So the forest will become a beech forest</p>
<p>Of the four debate questions:
- what is the pea plant problem with answers 250 or 500?
- what is the colorblind son problem with answers 1/2 and 1/4?</p>
<p>@yjkimnada
- it was asking how many pea plants were homozygous dominant, and given that ~790 showed the dominant trait and ~275 for the recessive trait.
- It was asking what the probability for having a colorblind son was if the mother (?) was heterozygous and the dad was normal.</p>
<p>Does anyone remember the first question on Molecular about mitosis? I don’t exactly remember the question itself, but here were some answer choices:
- when the centrosome/centromere (i always get the two mixed up…) begins to separate
- when the nuclear membrane disintegrates
- when the dna replicates
- two more choices</p>
<p>when centrosomes seperate…not centrioles lol that would make no sense</p>
<p>@insurrection, it was asking about anaphase or the chromosomes moving to opposite poles. It would be when the centromere splits.</p>
<ol>
<li>so 75 percent is homozygous dom or heterozygous. and 25 percent is homozygous recessive. So the parents were both heterozygous. This leeds 25 percent homozygous dominant, 50 percent heterozygous, and 25 percent homozygous recessive. So 250 out of about 1000 is homozygous dominant. correct?</li>
<li>Is the colorblind question assuming that the son is already decided and the probability of just the colorblindness? Or does not assume the gender of the child?</li>
</ol>
<p>And what was the exact word for word question of the ape problem?</p>
<p>@yjkimnada
- correct.
- it the probability that it is a colorblind son, not that a son is colorblind. I double checked the wording of the question, because i’ve been ¡tricked! before.</p>
<p>@insurreciton
- yay so the answer is 250. i think we can be sure of that.
- so the gender has to be thought about when finding the answer. Here are the letters:
Y=y chromosome
X=normal dominant x chorosome
x=recessive x that has colorblindness allele</p>
<p>Mother is heterozygous (carrier): Xx
Dad is normal: YX
Their children can be:
XY, XX, xY, xX</p>
<p>Of the four, only 1 is colorblind son. So the probability is 1/4</p>
<p>i cant believe i assumed it was only tlking about the son</p>
<p>IM still super confused about the ape problem.
i dont even clearly remember what two skulls the problem was comparing?</p>
<p>human and ape thats all…i guessed it was brain :)</p>
<p>If it is between Ape and Human, then brain cavity is indeed correct.
[Cranial</a> capacity - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/Cranial_capacity]Cranial”>Brain size - Wikipedia)</p>
<p>The information is based on studies conducted by Columbia UNiversity. As organisms of the hominid group evolve to humans, their brain cage/cavity increases every time. Thus, the brain cages of humans must be larger than that of apes. So i guess that is firmly decided too.</p>
<p>it made the most sense</p>
<p>Yeah. I did tried to dabble with the option about nerve canals or openings or smth like that. but the brain cavity just seemed to “common-sensical” Many readings also tell me that the answer to the control problem of the IAA plants is all three. Anyways. I think most of the question/answer debates have been resolved by now. Now that we have all the answers, I would like to know how you guys did if that isnt too awkward. hopefully we can get a sense of the curve if we know some scores.</p>
<p>I have 3 wrong (yeast fermenatation, carbon cycle rock, and reptile egg)</p>
<p>Edit: I just realized that the forest problem beech/mixed deciduous has still not been firmly decided on.</p>
<p>i have around 6 wrong 
cud be more on the ones we didnt go over but idk</p>
<p>what about the farm runoff water questoin…i almost put eutrophication but i dont think you can assume the water went to a lake…so i put it would allow the farmers to have more water that they can use productively or something like that lol idk</p>