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Retired NBME 21 Answers

nbme21/Block 1/Question#47 (reveal difficulty score)
A 26-year-old woman (III-2) comes to the ...
50% in females but near 0 in males ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: genetics pedigree

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 +18  upvote downvote
submitted by โˆ—drmantistoboggan4(18)
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tI iads it was laaft to mlaes in ueto,r adn the outeniqs aedsk obuat lvei norb nif.gfpors cienS the almes tnearโ€™ bngei brno ni hte rfsti l,caep I idsa %50 elseamf nda 0% aslem.

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hungrybox  ufkc i gto edabti +37
jcrll  vloie-n"br "pffiosngr โ† tibaed +29
sympathetikey  eSma /: +
arkmoses  msh +
niboonsh  wyh si it %05 lfmeaes ?hot +2
imgdoc  eflt leki an oiitd efrat i dufregi out wyh i tgo htis g.wrno +3
temmy  oh its!h +
suckitnbme  hisT 'tsni yclxate ihgtr as lmesa acn itsll be bonr sa ievdnecde yb silvaduinid III ,16,9.1 hTsi cilslybaa na xel-indk vsseecier i.asdees A eiarrrc rmeoth can tllsi assp hre olamrn X mrhooescom to a osn %(05 ah.ce)cn sI't tusj atht eht rtohe 50% ahncec fo aigpnss na aedetfcf X cmhmsooroe ruselst ni etadh of hte tsefu ni etr.ou Thus lal aemsl atucylal bron liwl tno eb fdtace.ef +6
makinallkindzofgainz  u@nikbm,ctes torr,Cce utb fi oyru'e a v-obrenil lame, ouy 001% ofr rseu do TNO aehv eth iedssae, os teh aencch fo a nrbvlo-ie amel ne"gib cfaet"efd is 0. +8
spow  eiutcsnmbk@ 'tsi otn nieXl-kd sveercsi,e rohsiwete ervye senlgi ons loudw be efafctde nad oeererthf aehv iedd ni etuor. 'Its eklX-ndi odantmni +5
qball  ebiJaa-dilt +
srmtn  croretc pos@w fcefdeat mfelea=s X dinkle Dainmotn +



 +8  upvote downvote
submitted by โˆ—nwinkelmann(366)
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diegePer = XDL (tno lla sngteoanier edtefacf = idl,e-Xkn ftcfsae easlm dan laeefsm yasirllmi = i.matnond)

Afetcfde aerhsft = 01%0 irnsmoiastsn ot dgat,erhus %0 ssnotmasniir ot ss.on
eft Afedc mhtsoer = %05 to sg,athedur %50 sniiroastsmn to .sB honsot atpnser eeadtfcf = %010 rssaosmnntii to drhutgaes (ude to sehtf'ra X )ehmcosm,roo 0%5 nmsisnsaoirt to nsso (ued ot t'oemhsr X s. meohBootom)hrc nteraps tecdaeff chae gaiintrmnstt thbo ot huretdag sooumogh(zy h)urgteda = %05 and emro sveer.e

If oniidcton si uimrlyonf aaltf ot aemls in t,ureo then eth 05% adfcetef sebda on msosatnrini (sa bev)oa wlli eid in ,turoe dna eth 50% ton datffece liwl evah evli i.hsbrt hisT a,mens iksr fo fmeeal bengi afdfetec = %50 dna kris of vbnilero- alsem gbnei tdfcfaee = 0.%

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divakhan  I eeelbvi sti nto L,XD dah it ebne trhee lwuod ltlsi be %25 echcan fo mlsae ot be aomlrn cagnorcdi ot eht entnPtu .aruqse (AF 0220 Pgea 59. +
divakhan  ^ %50 haeccn fo nbgei nmarl.o. hiwhc is OTN in eht ,wnesar ti adis 0% enccha ni aes!ml +
divakhan  uPsl uyod' ees edesias ni RVYEE einnoatgre fi it asw oDtnimn.a orF it to eb XD,L the fheart ,I1 odulw hvae msidttreant ti to ish rudg.taeh Ieadtns hte prasent rea arircer ni Gen I. os ist LRX esideas ,I(I 3 geibn a omozysuogh XRL )elfeam +
plzhelp123  isTh is liXne-kd atinmodn tnkh(i tRet moen,y)srd if ti reew x-ndeikl ,siseveerc a emealf wdoul edne to haev 2 tfaedfec x hrcosmmosoe to be tycaiom,mstp chhiw uldwo enma hre feahrt loudw EAHV to eb pmtmiytoasc sa he sah lyno oen X mro,somecoh wcihh is sopsiibelm sa eh wdolu vaeh eprehids u-otni.re Teh ansoer hte swenar si 0 in mslea si sacbeue het oiuqtsen ksas cialfecsiypl obtua ilbrne-ov esml.a If it dah ksdea htaw si teh srik of eth utfes ibneg efacedft ehtn it uoldw be 5%0 ni eamsl bu(t atht 50% ulowd tno eviusvr ot t)hrib +2
unknown001  my ediocaoenmmrt,n vaoid tnrgyi ot fugire tuo twrhee ist x dnilke nnotadim or rsicvees,e sa dnoig so will nto lphe in tignget ot teh ointp fo the uqste.nio +1



 +2  upvote downvote
submitted by โˆ—ragacha(17)
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na/tioiI/iwgr_ngkioisnt.thkt/nn:eiiiipcpptnwede.eam/

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 +0  upvote downvote
submitted by tsp(0)
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Is teh mwona in eht iftsr aegnnertio 1(2) nto faedtefc beceuas fo epiltcomen ?2cneatp(e1n)er ash to ehva eth taitr for eht desasei to vdeeplo in the ruteuf gnreone.tai

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b1ackcoffee  eedaiss vleepddeo ude ot erglnime mcisamsio (aoniumtt ni of teh eoycto) +



 +0  upvote downvote
submitted by โˆ—adong(144)
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I eknw ti dah to eb neXkdil- aeeucbs it dsia hatt it asw tfala to mslae owh aevh ti in o,tuer ubt I adh a ahdr tiem gcneiddi ebeenwt aiomndtn nad vsi.eceers llaUmttyie ti ash ot be -ldikneX minaodtn aebusce eth eectfafd otemhr ni eht coesnd raineonget evag bthri ot cendeutffa onss (hiwhc c'atn papnhe ni l-inXkde vecsesre.)i ahTt emnsa eth emroht ni teosqniu is zotgoehuyers dna her tedhuargs lliw aehv a 05% cacenh of ntrieiighn eth eisdase liweh reh sson avhe ot be fdfneeatcu fi htye ivl,e as eusprivo etporss .tdmnoneie I di'ntd irugef thsi uot ulnti ywa erfat eth .itth.e.sts oen saw a o.zydo lSitl otn resu atth tsi' XDL euascbe who ocem oybndo ni eth trfis gne ahs it? sGunigse ti was a pousenaosnt ?atitmnou

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 -1  upvote downvote
submitted by โˆ—an_improved_me(91)
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tHneso etu:ionqs Why does ti aemttr htaw tartpen fo ichitenraen it ?sha roF lal ew oknw, its t-tulctaoianr'cila/mf eb etrmededni.

I eelf eikl hte etssiae yaw to wenrsa it :si gndengiacowlk it is muioy"rlfn tflaa to malse ourtn"ei- = 0% cehnca rfo a;emls adn ltieg tsuj uncgtnoi eht oncrafti fo lemsefa ni ietneranog III thta avhe eht edesisa = 64/ ~50%.

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 -4  upvote downvote
submitted by โˆ—divakhan(18)
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siTh is otn XD,L tsi LXR ieseasd (FA 0220 apge 95)

Her,e eth htorem is zmuoyoogsh fro het imtouant etroherfe she ssialpdy eht ea.sdeis

eW ese ,atth

  1. tI psiks sntonegreia
  2. aelsM are oemr rlyeesev deeftcfa dei( in eo)tru
  3. leaemFs ear afeecfdt yn(ol henw yuoohzgs)om

eHre we s,ee ttha eohtmr anc pass itdfeecev X oocmomersh ot 50% lemsfea p;am& toerh 05% lwli eb rascirre tahey(hl X eomorocmsh from htra,fe ievcdfeet romf eootm)hF rr l,esma hMetor psssae detficeve X moeomrohcs os htey dei (noyl 1 X )mmhcerosoo

oFr the alsme hwo rea ginivl (III 16,1 nwhso ni epgrd),eei yeht vahe eebn lkycu ot eivruvs eud ot cmmsii!sao ;)

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b1ackcoffee  tdn'o uoy inhtk uoy era inggo torghhu too nyam hpoos mss?span(u)oit lame eiuvvsr ued to ostB?siimtercma e anchce is edsasei arstetd edu ot lernmgie misamocsi and it IS X.LD bwt the esaedsi is iaienctitonnn neptgiim n(ot nrceseasy to nywo uo.r)k odcsne ltsa apra stedn'o akme ssen,e ader gania ihtw hsfer dnim dan p.vesteerpic +1
malienca  i dnswreea teh enutqsoi leik dnvaakhi adn ti cema out gh.itr it oloks eomr eilk a XLR +



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