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NBME 22 Answers

nbme22/Block 4/Question#40 (18.6 difficulty score)
A 5-year-old boy with mental retardation is ...
Maternal origin of both chromosomes 15πŸ”
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 +2 
submitted by haliburton(208),
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arrdeP llWii = ntaPaler dnloiete larpa(it ro llf).u tdoeN fro ntri.mpgini ousCni ot nenlAgnma tieoopps( eodt)e.lni

AF 71:20 52 % of eascs deu ot araenmtl anplruantie yosidm wot( lmarelatyn drtnpmiei enseg rea eceder;iv on ntaleapr enge ice.dveer)

drjungly  Physeo video explain this very clearly, +  



 +2 
submitted by rogeliogs(9),
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ct:Fa 5%7 aer deu ot a tonldiee in hte ognl mra of het srmchooeom .15

tu:npI hisT uesinqto ercdtik em up beuseca wneh I wsa a deentoli in teh c1hr5 sa na otpion I ughoth I" ogt t"i btu alluycta I ddi ton cbueaes ti si not in eht tshor arm is in eht long .mar

beto  there written "studies do not show deletion in the usual site on chromosome 15." +1