12/10/2016 DefinedSTEMConstructedResponseDNAAndForensics
http://www.definedstem.com/tasks/index.cfm?asset_guid=21C52F0FDABD4B2CAED2273C092FDAA3&blnPrint=1&blnStudent=1&t=2wokk 1/2
ConstructedResponse:DNAAndForensics
DNAisfoundinalmosteverycellofourbody.EachofushasourownDNApattern.Thispatterncanbefoundinskincells,blood,hairandsaliva.
WeleavecellswithDNAeverywherewego.Forensicsistheuseofscienceandtechnologyforinvestigation.Manylawofficersuseforensicstofind
peopleanddeterminewhotheyare.DNAisanimportantpartofforensicsandisusedtodeterminesomeone'sidentity.
Stimulus
DNAisfoundinalmosteverycellofourbody.EachofushasourownDNApattern.Thispatterncanbefoundinskincells,blood,hairand
saliva.WeleavecellswithDNAeverywherewego.Forensicsistheuseofscienceandtechnologyforinvestigation.Manylawofficersuse
forensicstofindpeopleanddeterminewhotheyare.DNAisanimportantpartofforensicsandisusedtodeterminesomeone'sidentity.
ForensicscientistsusesmallsamplesofDNA.Thesesamplesareusuallyobtainedasevidencefromlawenforcement.TheDNAmaybefroma
potentialcriminalorthevictimofacrime.Itmayalsobeusedtoidentifysomeonewhohasdied.Twentyfiveyearsago,scientistAlecJeffreys
fromGreatBritaindiscoveredthisprocess.ThecellsofhumanshaveanucleusandinsideofthenucleusistheDNA.ScientistsremovetheDNA
fromthecell.Whetherthecellisfromyourcheek,skin,orhair,theDNAisthesame,soanyofthesecellscanbeused.Inhislaboratory,he
learnedthateachindividualhasadifferentbarcodethatrepeats.Thisbarcodecouldidentifyanyindividualandalsotheirfamily.
Forthepasttwentyfiveyears,investigatorshavegatheredevidenceandsentitofftoalaboratorytobeanalyzed.Thisprocesscantakealong
time.Today,scientistsareworkingonportablemachinesthatcanspeeduptheprocessandbejustasaccurate.Thisprocesswouldhelpscienceget
closertowhatweseehappenontelevisioneveryweekoncrimedramaslike"NCIS".
ScientistsinEuropeareworkingonatestthatcanhelppredictpeople'shaircoloronthebasisofDNAinformation.UsingDNAinthecellfound
atacrimescenethistestcanbeperformed.Ifsuccessful,thisnewtestwillhelpfurtheridentifyapersonwhoseidentityisnotknown.Further
researchislookingintohelpingidentifythroughDNAsuchtraitsasage,nationalheritage,andskincolor.Assciencemovesforward,itwillbe
moredifficulttocommitacrimeandnotgetcaught.
Prompt
ExplainhowDNAcanbeusedtoidentifycriminalsandvictimsofacrime.
Rubric
DNAandForensics
12/10/2016 DefinedSTEMConstructedResponseDNAAndForensics
http://www.definedstem.com/tasks/index.cfm?asset_guid=21C52F0FDABD4B2CAED2273C092FDAA3&blnPrint=1&blnStudent=1&t=2wokk 2/2
AchievementLevels
Criteria
Groups
0 1 2 3
AchievementLevels
Criteria
Groups
0 1 2 3
Response
(x1)
Aresponsegets
nocreditifit
providesno
evidenceofthe
abilitytoexplain
howDNAcanbe
usedtoidentify
criminalsand
victimsofa
crime
Aminimalresponse:•giveslimited
evidenceoftheabilityexplainhowDNA
canbeusedtoidentifycriminalsand
victimsofacrime•includesidentification
ofdetailsbuttheyarenotexplicitormake
onlyvaguereferencestothetext•supports
theexplanationwithatleastonedetailbut
therelevanceofthatdetailtothetextmust
beinferred
Theresponse:•givessome
evidenceoftheabilityexplainhow
DNAcanbeusedtoidentify
criminalsandvictimsofacrime•
includessomespecific
identificationofdetailsthatmake
referencetothetext•adequately
supportstheexplanationwith
relevantinformationfromthetext
Theresponse:•givessufficient
evidenceoftheabilitytoexplain
howDNAcanbeusedtoidentify
criminalsandvictimsofacrime•
includesspecificidentificationof
detailsthatmakeclearreferenceto
thetext•fullysupportsthe
explanationwithclearlyrelevant
informationfromthetext