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Retired NBME 22 Answers

nbme22/Block 2/Question#34 (reveal difficulty score)
A 30-year-old man and a 24-year-old woman ...
1 in 600 ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +27  upvote downvote
submitted by โˆ—drdoom(1206)
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laClncstaiuo for dad. heT apirtilbbyo of het artfhe enbgi a riecrar si /23 siecn ti si nnokw htta he snedotโ€™ vhae eht ideeass. Tenh hte byiraiotblp of ihm snapgsi ti on to shi idk is /21, hts:u

  • aitPyiobblr fo add geinb iecrrar = /32
  • bblirPityoa of dda npssgia no ssieade llleea = 12/

uCillanctsoa rfo omm. thWi the HbWrredna-geyi cr,inPlpie ouy anc ruegfi tou eht aylrpbtbioi fo teh rmeoth engbi a crraeri:

q = s/01tr)04,0(q0 = 0021/

,oS 2qp = 2 * 1/002 * 12/9009, hwich is ppraox 0./101

For the hcidl ot teg the llaeel mrfo ,omm owt thigns eedn to enpah:p )(1 omm sumt eb a rcerari ertth[zygo]โ€œoโ€ee dan ()2 omm umst psas eht leaell to id:hlc

  • tyarioiPlbb of mmo einbg rcriaer = 10/10
  • yrbbialiPot fo mom sgnipas no saesedi alleel = /21

tuPign ti lla ghretoet. w,oN bneicmo all reohtt:ge

= rbytpblii(oa fo add gnieb eira)rrc * l(yriibtobap of dda ipsnsga on siseead eal)lle * ipiaro(tybbl fo omm nbeig rceai)rr * rapbitb(yiol fo mmo ssagpin no aisedes )lellae

= /23 * 2/1 * 1010/ * /21
= 1 ni 060

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kernicterusthefrog  To ouqet rhTogy oTr,h dagr qenue: "w,e e,usJs gsros" +52
niboonsh  hsTi suioqtne msake em tawn ot oivtm +14
drdoom  lol +
5thgencephalosporin  okay oww +
tekkenman101  You nca meka hsti a tlo ikrquec yb sgiun msielp erlus rof olamaoust evsreceis se).sa1 desi aetfdUfcen rtenpa tihw faetcdfe eaeginl illw eb a irrerac /23 of the ietm )2a(A ) efcquynre in uaopiotpln is esupr wol so ouy acn ingreo P dna sjut ues q2)( ni dorer to alaetlccu recrrai eyqfunrce. oS ekat the uasqre ootr of the guoyzhmoso eescsiver reencqfuy /,040100)( adn ustj pgul it in: 002).(5 = )13.0 eTh dsdo fo ethri dlihc gineb ectaedff htwi teh owt taesnrp eignb admsues tlthypoiahce eicsarrr is /41 )a(a or .5'a2D.d s reraric ecahcn (2)/3 x 'oMms arcirer cacnhe (.1)0 x csdl'hi enhcca fo nbeig svieecsre 2(.)5 +1

Instead of doing all those calculations for the mom, you can also just multiply the dad's probability by 1/200 โ†’ q, the probability of the allele in the general population

+1/- hungrybox(1277)


 +4  upvote downvote
submitted by โˆ—keycompany(351)
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ndaiMeanl einsetG:c

anM sha /32 ccnhae fo inegb a .erarcri (eH deso ont hvea eht a.isesed) nmaWo arirrce ksir tums eb tealcdaucl hitw ^p2 + 2pq + q2^. ^2q = 040,1/00 q = 1,2/00 p si uorylhg = 2p1q = /0110 = riraCer cryfenuqe .

ksRi fo gvnhia a dhcli usth qseaul 23/ x 1010/ x /14 = 060/1 ese/B:u c23a = naM Crairer rkis 01 1/0 = eFealm reriCra 4i1sRk/ = haneCc ehty aehc psas no eht escvesrei nege ot rteih girson.pff

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hello  eeS ym lnptnxaoeai if uyo eden erom swdor ot pilaxen iths laennxoiatp +2



 +3  upvote downvote
submitted by โˆ—hello(429)
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hTis hte amse sa @kmoyanpey'sc xonaiptnlea with orme aleainxopnt ehost htat ened .t.i.

heT aitnetp si eftucneafd yb teh utlrrpciaa amuootasl evcreeiss edseias nda his ohbrter has het ooalumats cesviesre edaiess t&-g;- thsi asenm heca fo theri tpreans raciers eth AR ellael. N,wo for eth eptinat to eb nuedfcetfa envig ahtt obth shi tarensp ehva eht AR ale,lel ti nsema atht the ateitnp sha a /32 enahcc that eh si iaoluustmeylsn ateefufndc nad a ci.aerrr

hTe sita'epnt ntrapre is dcufetefna adn mrnoal -rgyaediWnerbH nseecigt sa( aettds ni het .peohebml).wrn tish is liafcpsyielc itdnmeon,e uoy rea ot musesa atth hte apnrter sha a airrcer crenyufqe rfo eth AR lelale, hciwh eqlau to p2q.

eTh sdeaies ash a rqcnueefy in het aotpnoiupl of 0100.4/0 shiT is 2q^ --;t&g 2q^ = 00/.0041 iogSnvl rof ,q yuo gte q = 021/0.

iaCrrer freqnceyu is q.p2 eewrvoH, rfo a aerr eiesads, p2q โ‰ˆ q.2 o,S eht eicarrr necqruefy orf hte retranp = q2 = 2 * 0/012 = .0101/

Nw,o hte Q sask uatob na srpofnfig fo eth apnetit nda sih rnpreta bnige feetdacf, so ot veah na etdcaffe hildc, herte si a 41/ cchaen fo vaihgn an ftafeced lhidc s(eecubsa het ienptta adn hte ptarner boht vhae a /12 ceacnh of igsnasp eth llaele -&g-;t you lumtilpe teseh etohtegr 12/ * /1.)2

,So ymulpitl 32/ * /1010 * 41/ = .0/601 hTsi is naiPtet(p egnib a recra)ir * eaprrtP(n ibnge a erri)rac * vg(Paihn an cefeafdt prfgfnosi .g)rtohete

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 +0  upvote downvote
submitted by beastfromtheastx(0)
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hTe ilaytoribpb fo eth ethfra gbine a raeirrc is /23 incse ti is knwno thta eh dneoโ€™ts aevh hte se.asedi ehTn the ioblrtpiyba fo imh sgpsain ti no to sih kid si:

2/1 * 3/2 = /13

tWih het -rbgWrnyieeHad ipirlc,neP oyu cna ifuerg uot teh ybiioptrabl of teh rmohte nibge a cerrar:i

q = q1(0r0)t4,/s00 = 01/02

,So pq2 = 2 * 012/0 * 009192/, hiwhc axoppr si 010/,1 dan het tbiliaprybo of het idhcl getgtni hits elllea is /1100 * 2/1 = 0210/

:uTsh

20/01 * 1/3 = 10/06

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brill45  You ddi siht tighr tub I knith aemd it a bit oemr octmlepcaid anth eddeen ot be. oT ruefgi uto hte iilohekdlo fo a onrmad enspro ni eth tpunlpaoio isasnpg no a seesericv al,llee oyu jtus deen ot do )o(oaqustrerq2 to etg to .q And jtsu esu taht q ot pitlmluy tihw the 1/3 uyo otg errie.al ehT q alvue ellst ouy het llaele ucqreenyf ni hte lipn,outapo werhteh het sonrpe is a rricera ro sghooozumy eisceevsr tbho. oYu tlisl tog ti, ubt tsuj lgeitnt yuo ownk the eaersi urtoe ni ecsa you see it ania!g +2



 +0  upvote downvote
submitted by kdckjn(0)
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wyh teher si pybriiolbat fo earfth iegbn a errarci is /23

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drdoom  We sesmau isth is a sciresvee ass.deei In ohter s,dowr oyu mnfatesi hte asdiees fi yuo enthiir a sasieed ,lealle d, mfor oryu omhtre and a dsaesei eellla, d, fomr oury rhate,f gvnigi yuo an lealle gianpri oedednt by dd. dd = uoy aevh eth sadsee.i ehT hraetf sode tno evah eth es;sedai hsit nmsae ihs tpnygeoe acn only eb 1 of eerth thng:is D,D d,D or .Dd htaT ,is DD = D ofmr shi a,dd D mfro sih ;omm Dd = D rfom ish ,add d rmof ish omm; or dD = d fmro shi add, D rofm ish m.mo tiNoce taht ni ylno tow of shete 3 sitpiiosslbie sdeo eth raetfh opnt(leti)lya vaeh a assieed leelal )d( thta he mihtg spsa on ot shi .orepyng +

We assume this is a recessive disease. In other words, you manifest the disease if you inherit a disease allele, d, from your mother and a disease allele, d, from your father (giving you the allele pairing denoted by โ€œdd โ€).

dd = you have the disease.

The father does not have the disease; this means his genotype cannot be dd and thus must be one of 3 things: DD, Dd, or dD.

That is,

  • DD = D from his dad, D from his mom;
  • or Dd = D from his dad, d from his mom;
  • or dD = d from his dad, D from his mom.

Notice that in only two of these 3 possibilities (โ…”) does the father (potentially) have a disease allele, d, that he might pass on to his progeny.

+1/- drdoom(1206)


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