<p>A certain genetic defect is caused by a sex-linked dominant allele with 70% penetrance. If a man w/ this genetic defect marries a normal woman, what percentage of their children would have this defect?</p>
<p>a) 25% b) 35% c) 50% d) 70% e) 90%</p>
<p>I’m pretty sure its B.</p>
<p>in a chromosome w/ the genes E, F, G, and H, the crossing over frequencies are as follows: E & F: 11% / E & G: 9% / E & H: 3% / F & H: 8%</p>
<p>What of the following are possible crossing over frequencies of genes G and H?
a) 6% b) 8% c) 12% d) 17% e) 19%</p>
<p>I got two answers, I believe I put A and C, but am too lazy to redo this problem right now lol.</p>
<p>For the second electrophoresis question (Part B), which amino acid will move the quickest towards the positive pole in this trial?
a) aspartic acid b) glutamic acid c) lysine d) glycine e) leucine</p>
<p>A is the right answer for sure.</p>
<p>True or False
The sensation of cold doesn’t depend upon which section of the brain the cold receptors are wired to, but upon which receptors are stimulated.</p>
<p>I put false?</p>
<p>Bone has interlocking stipules of calcium carbonate</p>
<p>false?</p>
<p>The perception of sound is mediated by the movement of fluid in the semicircular canals against the cupulae </p>
<p>@Darksigma - you’re right on the MS question. I don’t know what I was thinking
Also, how do you know it’s aspartic acid? More to the point, why couldn’t it have been glycine? I ended up putting aspartic acid because I figured Coulomb’s law would be more important, but I wasn’t exactly sure where it came from. </p>
<ul>
<li>Bone is made of hydroxyapatite and collagen, so false</li>
</ul>
<p>The gene for whether an individual has bending ability has multiple alleles. Assume that water bending is dominant to air bending and both are dominant to nonbending. An air bender male who comes from a true-breeding lineage marries a water bender female whose parents are both benders, but whose brother is not a bender. What is the conditional probability that these two benders will have an air bending child?
a) 0% b) 25% c) 33% d) 50% e) 100%</p>
<p>A certain country has an overall infant mortality rate of 2%. However, 15% of all births require C-sections; 96% of these babies survive. What is the probability that a baby will survive birth w/out a C-section that is not required?
a) 96% b) 98% c) 98.4% d) 99% e) 99.5%</p>
<p>Matthew was given a plant tissue specimen to examine under the microscope. He observed a large number of fibers compactly arranged in parallel bundles and a small amount of ground substance. Which of the following might he also observe in the specimen?
a) Basement membrane b) a large amount of tissue fluid c) matrix of inorganic material d) few cells e) a large variety of cell types.</p>
<p>True or False
Two different sympatric species will never occupy the exact same niche</p>
<p>Weather is a growth limitation that is characteristic of an animal population with short life spans, early reproduction, and high reproductive rates.</p>
<p>Physiological changes induced by crowding rather than a period of unfavorable weather would most likely act as the limiting factor for an insect population exhibiting a boom-and-bust growth curve.</p>
<ul>
<li>The C-Section question was 98.4%</li>
<li>I wasn’t sure, but I put D</li>
<li>I put true for the sympatric question, but I wasn’t quite sure</li>
<li>True for the weather question</li>
<li>I think the answer to this is false, but I’m not sure what I put.</li>
</ul></li>
</ul>
<p>The aspartate question depends on charges: molecular weight is really insignificant here because gel separation only truly distinguishes by MW when you’re separating massive differences (on the order of kilodaltons). Remember, aspartate has the lowest pka and therefore if the separation gel is buffered at pH7, aspartate will have the most number of --COOH groups ionized to --COO^-</p>
<p>The water bender question is incorrect; the question needed to specify that the parents of the water bender were both water benders - if you make that assumption the answer is 33%. Otherwise, you get an answer that isn’t one of the choices; I’ve notified the usabo people and the question might be thrown out.</p>
<p>Matthew was given a plant tissue specimen to examine under the microscope. He observed a large number of fibers compactly arranged in parallel bundles and a small amount of ground substance. Which of the following might he also observe in the specimen?</p>
<p>a) Basement membrane b) a large amount of tissue fluid c) matrix of inorganic material d) few cells e) a large variety of cell types.</p>
<p>I thought he was looking at something like a plant stem with large amounts of secondary growth - I put E</p>
<p>True or False
Two different sympatric species will never occupy the exact same niche</p>
<p>True</p>
<p>Weather is a growth limitation that is characteristic of an animal population with short life spans, early reproduction, and high reproductive rates.</p>
<p>False - this is usually true for k-selected species</p>
<p>Physiological changes induced by crowding rather than a period of unfavorable weather would most likely act as the limiting factor for an insect population exhibiting a boom-and-bust growth curve. </p>
<p>True - @BeanDelphiki: makes sense right? when density goes out of whack, density-dependent factors rather than density-independent factors should direct population dynamics</p>
<p>Re: Density question - That’s what made sense to me, but I had a bio test a few weeks back where the answer to the same question was false instead of true. Thus, I was somewhat confused.</p>
<p>Also, wouldn’t weather be more of a limiting factor for a relatively weaker animal (i.e. an animal that dies young and reproduces early, r-selective) than for a stronger animal (lives a long period of time, k-selective). Of course, stronger and weaker are relative, but I’m referring to their survival ability. It seems logical that weather would hurt an r-selected animal more than a k-selected animal.</p>
<p>r-selected species would be better in changing CLIMATES, but not necessarily weather. Weather is a one-shot type event, so it wouldn’t necessarily have the same effect. Evolving for weather is also somewhat pointless, as it isn’t a long-term pattern. Or at least, that was my reasoning.</p>
<p>What did people put for the hormonal therapy question (last part of the first FRQ)? I wasn’t exactly sure what they were asking, so I just put everything produced by the anterior pituitary but prolactin.</p>
<p>Organ affected: Anterior pituitary
Hormones not produced: HGH and Gonadotropins
Therapy: Injections of HGH
Other possible symptoms: high body fat, reduced bone density and muscle mass, childish features, reduced sex drive</p>
<p>You can go on same website for other phylum.</p>
<p>I think that this exam was deceptively hard now that we are going over it. Not as hard or murky as last year’s exam but still pretty challenging. From going over the answers, I got a 65-70%, hopefully third time is the charm for getting to finals.</p>
<p>@emblem101 - For the FRQ, I felt that EVERYTHING produced by the anterior pituitary would be affected. The symptoms you gave are mainly just extensions of what they gave already (no sexual maturation, little growth). I may be mistaken, but it seemed to me that the only way that the question made sense was if it involved EVERYTHING produced by the anterior pituitary. I mean - otherwise, the answers to a (what hormones is she lacking based on provided symptoms) and d (hormonal therapy) are basically identical. Then again, this may be yet another case of me overthinking the problem (@darksigma). </p>
<p>@kcanand - Technically, an organ is defined as just a “collection of tissues joined in a structural unit to serve a common function.” (Wikipedia, the most legit source :P). As such, the anterior pituitary (or at least, the pituitary as a whole) can certainly be considered an organ. Also, Turner’s Syndrome isn’t an organ disorder. While the symptoms may be similar, that’s superficial (one of the past campers, please correct me if I’m mistaken). </p>
<p>Crud - annelids don’t have lungs… now I feel rather stupid.</p>
