***Official SAT II Biology E/M December 2014 Thread***

<p>What did you guys get for the one that asked about bloodtype. I put AB negative/positive (whatever it was. this was the only option for AB blood type. All the others were like O negative/O positive)</p>

<p>@omarhaider‌ the bacteria in the growth medium was the exponential looking graph and the one about human height was the normal looking graph. </p>

<p>@niktheslick‌ I got AB negative/positive too. Seemed like the only logical one.</p>

<p>Cool @DarkEclipse‌. Do you remember what you got for the question about how asexual reproduction is beneficial?</p>

<p>Yeah, it passes on the exact genes to the offspring, which helps it survive in a constant, unchanging environment (it was something like this).</p>

<p>Ok thats what I got too! Also, did you get “inversion” for one of your answers. The question said something about 47 chromosomes @DarkEclipse‌ </p>

<p>@niktheslick I thought it was polyploidy?</p>

<p>@niktheslick‌ No, I got nondisjunction for that one, because inversion is simply when a chromosomomal fragment re-attaches itself in the reverse orientation, whereas nondisjunction is when two homologous chromosomes fail to separate themselves during meiosis, which results in an extra chromosome.</p>

<p>cuz it said the problem was at the sex chromosomes and there were two X chromosomes and one y or something like that</p>

<p>That was the character, or the condition, not the process, or what actually happened.
Polyploidy arises out of nondisjunction.</p>

<p>what about blue-green algae? and the graph for the camouflaging/territorial birds?</p>

<p>It sounds like nondisjuction. That’s how you get Klinefelter syndrome. Polyploidy is two or more chromosomes on a respected section. I think you were thinking of aneuploidy, having extra chromosomes other than 46, which derives trisomy or monosomy. </p>

<p>@k4vglitcher‌ Exactly. The diagram showed a case of trisomy-21 (Down’s Syndrome).</p>

<p>Well there you go. I didn’t take the test, just going off what you guys are saying. </p>

<p>Do u remember the camoflauge/terrestrial bird graph one? </p>

<p>@pizzacrayon what exactly was the question asking? And I got polyploidy! </p>

<p>@niktheslick Exponential being the one that didn’t xome down right? </p>

<p>@omarhaider‌ it asked to match the description with the graph. What would the graph be for the description: color of birds where females camouflage and males are territorial. What would the graph be if x axis is color and y axis is frequency of that color in the population of birds?</p>

<p>I definitely think its nondisjunction because it’s just like klinefelter syndrome</p>

<p>@omarhaider‌ Yeah exponential is the one that keeps going up</p>