AP Biology 2024 - FRQ Question 1 SOLVED!
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- Опубликовано: 9 сен 2024
- #chipmanbiology #chipmanapbiology
In this video, I provide a comprehensive solution for FRQ Question 1 from the 2024 AP Biology Exam. I go through the question step by step, breaking down the prompts and discussing the relevant concepts and information needed to formulate a well-rounded response. This video is a valuable resource for AP Biology students who want to review and gain insights into tackling FRQ questions effectively. By following along with the solution provided, students can enhance their understanding of the subject matter and improve their performance on the upcoming exam. Music by: bensound.com
License code: ZRGPRTZA6IJR71WY
this one was the most confusing FRQ by far I missed like 4 points and didn’t know what they were asking, the other ones were not bad
This one was pretty rough!
i know sooo many people who said there wouldn't be an effect, i said there wouldn't because crossing over simply affects genetic material and does not affect the process of chromosome separation but i completely missed that first sentence. i feel like that answer aligns more with what students learned during the course
Yeah, that first sentence was the key to the whole prompt really.
On parts (d)(i) and (d)(ii), do you think College Board will accept a prediction that CTF will not affect the normal chromosome number in the haploid daughter cells, on the grounds that there still is crossing over taking place? In figure 2, the bar chart indicates that CTF only reduces crossing over frequency by about 1%, which I assumed would not be enough to cause nondisjunction. Other than that, I felt pretty good about the rest of Q1. Thanks for working through these FRQs!
I think if you explained it like that, they may take it. In my experience, they seem to read lots of responses before settling on a definitely answer. It could be that lots of answers like your would push them that way. I think your case is a good one.
I explianed it the same way as you did.
@@mrchipman would I receive credit if I said that CTF will not affect the chromosome number because a decrease in crossing over only decreases the genetic variation but not the number of copies? Could I at least get the point for the prediction or is there a chance I get the justification point too?
Also, I didn't know that they read lots of responses before settling on the rubric. Does that mean that if lots of people said no impact for parts (d)(i) and (d)(ii), that might be considered an acceptable response for points? And could that affect the curve?
thanks for working through these!
@cedriche366 I think they get a sampling to make sure the question is answerable they way they intended. One last year they accepted two answers for. This one may be one of those?
I’m so cooked I got like 2 of those points
For part d I said it wouldn’t have an effect but after reading the first line again then I realized it was wrong but I had written out everything already and I was already out of time 😅
I’m sure you made up elsewhere
@@EthanPeng-ss7pe I feel like I didn't have enough time, the practice exams I took felt much more brief and to the point than these long passages that I had to read a couple of times to understand. I was already tired because of the MCQ and I was playing a football scrimmage later 😩
@@EthanPeng-ss7pe I didn't finish either I think I'm cooked 😒
@wii43jj yeah this is a long trudge of a test!
I said for d) (i) that since crossing over is lessened due to CTF protein there will be more genetically identical copies and I didn't even read the first line of the question
... and this is kind of what we've been taught in the course.
Yeah, I think that one is going to get lots of people.
So I think I would get the di point but I don't think my justification was correct, so maybe not the ii point.
i said the exact same thing lol
Hi, Mr. Chipman! Really appreciate what you are doing so we get an accurate expectation of our score. I have a few questions:
For part (bii), is it okay if I said that the scientists wanted to make sure that it was CTF that was causing the frequency of crossing over to change. If the modified CTF protein that could not bind to the DNA caused the crossover frequency to decrease, the scientists are unable to make that conclusion; the frequency of crossing over with the modified CTF protein should be the same as group 1 in the first experiment.
For part di and dii, I predicted that there will be a fewer number of chromosome 8 in the cells and I basically justified it as you said it (fewer would separate properly). But, my prediction was not the same as yours because you said there will be an abnormal number (more/less). Do you think that will get me 2 points, 1 point, or 0 points altogether?
Thanks.
I think B2 was pretty open ended, so I think your response would work.
I think that your responses for D1 and 2 are more specific than mine, and would work. I was general, but saying fewer would also be fine.
@@mrchipman So for part d, it's ok if we said less (and not more)? Thank you.
If i talked about independent assortment for 1a (ii), do you think they would count it?
I think so because that would cause the separation.
So on 1aii- the way I read it is that it’s asking specific to this experiment why some have only one fluorescent area after meiosis. In that case, would it be that the areas closer to the centromere (GFP) probably contain the kinetochore protein that prevents crossing over, whereas the areas (RFP) near that hotspot region are more likely to shuffle genetic material?
I don't think it needed to be specific to the experiment. It's one of the ways I think the new layout is good. Your reasoning isn't bad though so they may take it.
@@mrchipman I’m an AP Bio teacher, so nothing for them to grade. I just like to reason through things and fully understand before I use it as practice in my classroom. I really liked this question for unit 5.
@kaleighsidwellrn5116 Yes - great unit 5 question. I love the graphics on it and the concept of “hotspot”
I still teach map units but I haven’t seen it in years. This was pretty close.
That's what I said as well
If I said the IV was presence or absense of unmodified CTF or presence or absense of modified CTF would I get the point?
I think so. I almost said that myself so I think it would work.
For the comparison between IML and CTF would you say its likely I would earn the point if i compared both to the control group or no?
I don't think that would hurt anything.
Looking like 8 points for me 🙏🏽🙏🏽
Yes!
Ah this one cooked me so hard one of my weaker units that we did
I'm sure you made up on the other ones. Your MC is always strong as well.
Hello! For b(ii), would they accept an answer explaining that the scientists added the control to attribute CTF’s efficacy to its ability to bind to DNA? Thanks for making this video!
Yep I think that would work.
@@mrchipman thanks! And just to clarify one more thing. On d(i) and d(ii), I said that two cells would have two copies and two cells would have none. Because nondisjunction is more likely to occur with lower crossing over rates, Meiosis I would result in 1 cell having 4 copies (2 replicated chromosomes) and 1 having none, then when they separate again 2 would have 2 copies and the other 2 wouldn’t have any. Is that an answer they would accept? Again thank you so much for making your videos!
@aadhibala1792 I think that would work.
oh i said for b(ii) it would be a negative control.. so that's not right is it
It is definitely a negative control, but they may have been wanting more info.
@@mrchipman okay i explained a little what it means so hopefully its okay
For part a ii) I put that since one of the genes is further away from the centromere its likelihood of crossing over would be greater than the gene closer to the centromere. Thus one of the chromosomes would likely have 3 fluorescent markers and the other chromosome would only have one fluorescent marker. Is this a possibly correct answer?
I think maybe you included too much detail but they may accept the basis of your answer.
For the part about predict the effects on the numbwr of chromosome 8, I got the justification wrong and I put only increase for my prediction. Do you think i could still get credit for the prediction part?
Yep - two separate points.
Would the independent variable be the unmodfied protein because that's what I wrote? Also I said they had that as a control to serve as a baseline to compare with the Unmodifed protein to see the differences? Would I earn the points for these two questions?
The modified protein was what they manipulated so that would be the independent. The unmodified would serve as the control.
@@mrchipman but the question said how the modified served as the control?
@@mrchipmanFor the identity a idependent variable question, I wrote the use of the unmodified protein. Would this be correct since they are testing the affects of dna binding capabilities from the two different proteins?
@pyro4089 maybe; whether or not it was modified is the variable for sure
Why my ap exam was different?
Maybe because you had a different form? Sometimes they mix things up in order to test other forms.
On a related note, College Board typically releases only the Form O version of the FRQs. When bubbling in information prior to an exam, you have to write down the form code on the scantron. AFAIK, there are Form O (operational), Form I (international), Form A (alternate), Form M (mixed), and a few other forms.
@apphysicsenjoyer good info! did not know that!
Looking like 5 points on this one 😬
That'll do! Not a bad percentage!