I think I just wrote about crossing over and how it doesn’t happen in mitosis and also the law of independent assortment in meiosis. I explained how both contributed to genetic variation. Is that correct?
@CGlynn I think I mentioned anaphase and metaphase and that they both ensured that the chromosomes would separate into sister chromatids
For mitosis and meiosis differences I wrote about crossing over and independent assortment. For similarities I wrote about how both undergo PMAT except that meiosis undergoes it twice, i forgot what i wrote for the other reason.
@TodaysEinstein I agree that D. Polypepis was clearly the outgroup. I put whichever group had more in common with the D. Polypepis (I think it was A. Foresteri/G. Gallus) on the branching branch, and then whichever one had more in common with D. Polypepis on the other branch, and finally whichever had least in common at the end.
For 2a I completely screwed up and only described one process by accident (did not read the question), but what you said should be correct.
@TodaysEinstein For 3B I put amino acid, because similar morphology could be a result of analogous characteristics, and not true relatedness
I heard that the AP graders don’t even look at the PMAT names and focus more on the explanation of them that you give. So you could literally explain the whole process of mitosis without naming any of the PMAT
@pockysticks Agreed with amino acids. Definitely correct due to analogous structures. Also, it’s more concrete evidence.
@justinn and @TodaysEinstein I said crossing over and random orientation of chromosomes, because I’m not sure if it is exactly independent assortment that would make them different. Random orientation, due to chromosomes/chromatids being different in meiosis, would cause them to be different.
Also, regarding the mitosis question. If you described how in metaphase they line up at the center plate and in anaphase the chromatids or chromosomes separate (pulled apart), then you should get full points I believe.
let’s talk about the long responses 1 and 2
For 4B I put that meiosis goes through 2 divisions and produces 4 gametes while mitosis goes through 1 and produces 2 body cells but I think I misunderstood the question
@CGlynn pretty positive that both of those are acceptable because they are synonymous
When I saw the world “calculate” in second long response, I was like “oh heck naw” and just moved on to the next part.
for the mouse one:
- Self-explanatory what each does, though I only described two by accident (photoreceptors takes in stimulus brain integrates)
- the activity during light is not much if at all, during dark is near constant
- the difference is that during L12:D12 activity at the same time, during DD activity is at different times every day.
- Under L12:D12 it would stay the same, under DD they would constantly move until tired.
- get food at night, stay hidden during day from predators
for the cell respiration
- again self explanatory, though I only described one by accident
- all organisms suggests it is old due to common ancestry, earth used to not have oxygen, not all organisms have organelles so it would occur in cytosol
- multiply 7.3 * 30, divide that number by 686 for efficieny. Excess is released as heat.
- Something about endosymbiosis, though I said what advantage would it give them. This will most likely be marked wrong.
I’m feeling -3 on those due to bad reading on my part
Can someone explain to me the phylogenetic tree? I never went over that in my class… (along with many other things…)
@CGlynn what if i said mRNA express unique gene expressions?
What about question one and two
For 7B, did you guys put that since all 1000 smells still need to be expressed but there are not as many genes coding for receptors, that multiple smells would need to be expressed by a receptor to make up for it?
@TopOne For what question
@pockysticks The answer was RNA splicing. Sometimes RNA’s exons will be treated as introns and not expressed which will cause the gene to make different RNA sequences and therefore different proteins.
@pockysticks Don’t think I fully understood this question. I always thought that it was the other way around, that genes expressed a specific trait, not multiple at once. But I don’t think that’s what the question is saying.
7B) I put that receptors detect several olfactory molecules so many more odors could be smelled than genes/receptors.