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Hi, my guess is UPD (uniparental disomy), which can explain that gel. What do the other gels look like? It might be a case of eliminate the others and this is the best one. And like I said, UPD is a possible explanation.
I think this may be a good explanation. The gene involved was responsible for interacting with the synaptonemal complex and caused errors during meiosis I. Honestly, I had never heard of UPD before and the passage did not mention it specifically. Are we supposed to know this for the mcat?
I was between this answer and one that showed two bands for both the mother and patient but that's obviously wrong because the mother had to have the WT allele. I was just trying to figure out how the son could have inherited two copies of the recessive gene.
Thanks for that tidbit of info