NBME Free 120 The patient's DMD carrier status is uncertain because of random X inactivation (NBME Answers)

Retired NBME Free 120 Answers

free120/Block 3/Question#18 (reveal difficulty score)
A 23-year-old woman comes to the physician ...
The patient's DMD carrier status is uncertain because of random X inactivation 🔍 / 📺 / 🌳 / 📖
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submitted by ∗bwdc(697)

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MDD is .k-eindXl eW nowk her mmo is a aicerrr abesd on yliamf sori,hty udpetorps yb abl tgnti.se utB her mom sha 2 X mohsoecsmr,o nloy eon fo wchhi is utemat.d hrTee is on way ot nkwo hcwhi ehr druehtga tnleuevyla eesicrev adn essxrespe yb reh pheynepot (ei. fi esh si a ircrear ro tn.)o Jsut eucsaeb rhe KC is lnmoar ’stnoed eanm esh nts’i a rtr–ceihare yntehpepo fo teh ldin-ekX ercairr ednpdse on oa-ancvi.itnitX

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em_goldman sI itnvaonacXii-t not oyrmdanl smaoci ugrtuhooht tisssue? My ngkihint is htta ,ormdna esuddbiyiett-erlnv X ntivictaoa lduow uscea buaot hfl~a mtomsysp (ex Rett ,dmeynsor ndXil-ek ndinamot laatf ni etrou in esmal ubt uvblierasv ni aefsmel ude to tXav)-otinni.aci oS you ees ehr omm tihw semr)pe(ud ldiseaot ireacdsen ,CK chwih yuo uowdl teexcp in ehr fi seh aws olas a r.aicrre Mybea enetnoitpra si iabreavl so douy' eden icegnte sgnteti ot crmfnio for rues >-; eht nrsoea she dent'so eavh tsmopysm is oiann.c-txitavi +3

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submitted by ∗claptain(25)

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I dn'to dnnutrased sthi iuntqeso. yhTe uteqae rcr-aetsruisat to mane dtfcefea by the e.lalel eW kwon hre mehrto is a earirrc cuaesbe hes ash ealdteve CK. Tath emsan het eattinp sha a %05 cnecah to be a rreairc nisce hsse' mfelae. dRnmao toniniitacXav- 'ndtoes mttaer when anikglt aoutb riaerrc tsuast uebseca otbh llelase vhea a henacc to gte apessd .on oRnmda X iicantatoniv is olny trpoantim fro intiermngde thrwehe she wlil eeplvod ty.smsmop

I seugs shit si yhw eth iestnqou aws wotnrh t?ou lUsnes 'mI misgsni hmotig.sen

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claptain ,vNm shti eiutsnqo ldepay e.m I eazreil that E si the only epoilssb ochce.i tBho A dna B uwlod eb %25 hcsnca,e tno %50 eacncsh, and oyu ntacon uasems hhrteew ehs si or si nto a icrerar iwhttuo cnteegi ialysasn sc(oiche C dan ).D Ttha valese ylno .E +6

beansbeansbeans aWti I argee hwit oruy tsrfi mcone,mt acn uoy nxlpiea awht edma ouy engcah uyor ndmi nad atdernunds h?its +

yerpderp eyhT rea enrfgirer ot x anicainiovtt in het erthugda wcihh owldu anem hse lcoud eb a eraircr but we ctan elt.l +1

cbreland so reh omm si a erairrc uesacbe ehs ds'onet avhe pomleect tsmspyom elki eth rhtober nda encu?l? I usegs I tughhto ti wsa all of ihnognt hwit edeuchnn +

cbreland ,manD ehr omm is 0.5 nuchenDe ieatpnts odtn' leiv ttha n.olg.. nmv mubd on ym atrp, lhdsou ehav deam eht nnecioocnt +

j44n rhe mom ctna veah eht flul bnwol eesadis sbceeau ist na RLX ssdaee.i I ntikh ew hda ot rawnor sith donw by rssoecp fo ilnmaenoiti +

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submitted by rohan225(1)

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Why is teh senrwa rrcaier tasstu wnknuo?n hyW atcn' teh ohertm be ohouyo?zsmg nsehDuecn si X ilknde svreee.sci

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dkhan123 nto esru but hree si ym el ocg:Mlai- slginib fo itenatp sha dedi ofmr c,nnhDeue rgnmifnoci tomher MTSU BE eeihtr ftcefade ro a rretc-.Mhairre o odse OTN aevh teh Dunnceeh pehytpo,en but has evtdeeal em,szyne tggneigsus hse si a crer.ira hTe nehneucD vaeagre eifl eactxcenyp si 2.6 olsA the oeutnqis is wretitn cuhs ahtt ti plsemii hte rmohte dose not avhe the chenDeun oenhypetp dna eht edevalte nyemze lveel si ued ot het rrriace ststua of eDcnnueh dna nto an ernaltued ll,ssLati.e-lysn teh tdgehuar sah olnamr eynmez vsl.eel This codul eb due to wto bssleipo a,ersnicos terhei ehs niedteihr het enunhDce neeg dna hsa dtincaeitva i,t ro hes vnere irendhtie teh egne to bneig iwth. +5

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submitted by ∗netsirk2023(1)

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Tish prboaylb sah to do iwth aBrr sdeBio FA( 0212, pg 1.)6 To apareshrap ,AF etprenaecn dan resivtye fo eassseid in XX iuidvanidls can be deami.tcp DDM si ddilcune ni htier s.itl

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submitted by ∗madamestep(17)

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erH omm sha ghhi CK ucbasee hre X ntviiaonicat is liyelk bnlmecidaa ot aehv eorm umeatdt X xsepde.sre uBt onte thta a hhgi KC edso tno uqela -wlulfbonl Dcs.eeunhn 'Its imilasr to oHm-piihewe-onmla can avhe cnaiseerd ebnleidg but not flul epihlioham eesubca of shit moeonnpe.nh

Her tmroeh sah moes eencuhDn oytpne,hpe btu we odcul tsuj sa slayie ese no yepthnpeo ni a r.erciar

th,urreF fi sthi wmoan is a rrrc,aei her ichld has a 5%2 cehcan fo gieepnlodv DDM %(50 aechnc fo a ybo, %05 of hte bad X.)

ihTs wamno kyille ash a 50% hnacec of genib a rr,eacir ehs do'etsn veah DMD aebsd no ehr KC dna gae and gnedr.e

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