A2 Biology OCR June 2015 Revision Thread

Where you suppose to square root it??????????????

Did anybody put B for the table question where they are geographically isolated?

Where you suppose to square root it??????????????

What did you lot put for the question on the plant moving towards the light and the girl covering her eyes with her face? I started talking about phototropin 1&2 enzymes, and the sympathetic and parasympathetic nervoud divisions

Isolation can occur in three forms: Mechanical, Behavioral, Seasonal. The questions spoke about cant reproduce therefore that is mechanical or no?

The genetic drift one? Yes, because they had the biggest decrease in recessive alleles so the amount genetic variation had decreased, because increase in dominant allele frequency meant there was less genetic variation as all the individuals had similar genotypes


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With her face?

My bad I meant to talk about the question comparing the S drug to the M drug, I talked about the receptor being the incorrect shape on the previous question

It was insight learning and not operant conditioning, OC is learning by reward and punishment whereas insight learning is using reasoning and judgement from past experiences

The genetic drift one? Yes, because they had the biggest decrease in recessive alleles so the amount genetic variation had decreased, because increase in dominant allele frequency meant there was less genetic variation as all the individuals had similar genotypes


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But surely the bin is a reward, so if the raccoon learns to push the bin lid off it is rewarded? Raccoons go through multiple bins each day, so they're repeatedly presented with a bin and they've learnt that if they interact with the bin, they're rewarded?

I was 50/50 on putting operant vs insight but put operant because they phrased it as "the raccoon learns to push the bin lid off"

You know what I meant >_> hand with her face