Official SAT Subject Test - Biology E/M - June 2015

@Skarlo I think it’s deffo water evaporation

@vmiller7723 I don’t have a specific scale, I mean from googling around the curve for 800 seems to generally be -3 raw for both E/M.

I just skipped the pine tree question. I had no idea

yep. Also the E question with lobe fished vs ray-fished is kinda confusing but not a lot of people remember it or just took M.

For M #91-95 we had that thing with red/pink/white flowers (incomplete dominance) and T = tall and t = short. One of them said that given a heterozygote for both of them (I think) has pollen that produces a dwarf white plant, what’s the phenotypic frequency for this cross to produce a dwarf white plant?

1/16

@CollageWhat I think that was 0% because one of the parents was a red plant (RR), so there’s no way to get white from R alleles. (Even Rr is only pink)

If I take this test again (so take it twice in total), will it look bad to most selective colleges?

I had 0 percent

is the biology m scale a little bit more generous?

@Skarlo I don’t think we’re talking about the same question…I was almost certain the answer was 1/4 and 3/4 or 1/2 and 1/2.

@RybkaShredder @Skarlo weren’t those part of the regular test? Something about crossing two dogs heterozygous for two traits and getting the recessive phenotype -1/16? And then percent offspring with recessive phenotype when male was something and female was something? Did their sexes even matter? It said the male was homozygous dominant so couldn’t be sex-linked. I think it was fly eye color…

ah yes it was 0%, that does ring a bell. I was just answering the question based on the info you gave me.

@CollageWhat Oh I put 1/2 for that

I think biology-e has a more generous curve

what about the question about microtubules

Is it somewhat correct to say that you drop every 100 for every -3?

@nkim1912 not at all

@divsnimmagadda I believe that was anaphase. In anaphase, kinetochore proteins on the centromeres are connected to microtubules and so when the microtubules are shortened, the chromatids are separated and pulled toward the two poles of the nucleus. Metaphase would probably also use the microtubules because chromosomes are pulled to the metaphase plate in this same fashion. But certainly not prophase…there’s no real motion besides chromatin condensing.

Yeah, I put anaphase as well