BIOL-1033 EXAM #4 WITH VERIFIED
SOLUTIONS
The rhuman rblood rtype rAB rin rwhich rboth rthe rA rantigen rand rthe rB rantigen rare
rfound rembedded rin rthe rblood rcells ris ran rexample rof r- rcorrect ranswers r-
Codominance
An rX-linked rgene ris r- rcorrect ranswers r-a rgene ron rthe rX rchromosome
, A rman rand ra rwoman rare rboth rheterozygous rcarriers rfor rthe rrecessive rallele rthat
rcauses rcystic rfibrosis. rWhat ris rthe rprobability rthat rthey rwill rhave ran roffspring rwho
rhas rcystic rfibrosis? r- rcorrect ranswers r-25%
All rthe roffspring rof ra rcross rbetween ra rred-flowered rplant rand ra rwhite rflowered
rplant rhave rpink rflowers. rThis rmeans rthat rthe rallele rfor rred rflowers ris r_______ rto
rthe rallele rfor rwhite rflowers. r- rcorrect ranswers r-incompletely rdominant
The rorigin rof rmitochondria rin ra reukaryotic rcell ris rexplained rby r- rcorrect ranswers r-
Endosymbiosis rof ran raerobic rbacterium
Which rwould rbe rmost rlikely rto rbe rfossilized? r- rcorrect ranswers r-a rcommon rthick-
shelled rcrustacean
You runcovered ra rfossil rthat ryou rsuspect ris raround r100 rmillion ryears rold. rWhich rof
rthe rradioisotope rpairs rin rthe rtable rcould ryou reliminate ras ran rappropriate rchoice rfor
rradioisotope rdating rthe raccompanying rrock? r- rcorrect ranswers r-Carbon-14/Nitrogen-
14
The rEarth's ratmosphere rhas rchanged ra rlot rover rthe rpast r4 rbillion ryears. rOne rbig
rchange rwas rdue rto rphotosynthetic rorganisms. rTheir rphotosynthesis rincreased rthe
ramount rof rwhat ratmospheric rgas? r- rcorrect ranswers r-Oxygen r(O2)
The rfirst rliving rcells rwere rmost rlikely r- rcorrect ranswers r-Anaerobic rprokaryotes
The rprocess rby rwhich rthe rmajor rland rmasses rhave rshifted rtheir rpositions, rchanged
rshapes rand rseparated rfrom reach rother, ris rknown ras r- rcorrect ranswers r-
Continental rdrift r(plate rtectonics)
The rlikelihood rof rallopatric rspeciation rincreases rwhen ra rsplinter rpopulation ris
r__________ rand r__________ rthe rbroader rrange rof rthe rspecies. r- rcorrect ranswers
r-Small r; risolated rfrom
Today rthere rare r54 rdifferent rhoneycreepers rin rHawaii. rThe rancestor rof rthe
rhoneycreepers rwas rthe rEuropean rrosefinch. rThe revolution rof rmany rspecies rof
rhoneycreeper ris rthe rresult rof r- rcorrect ranswers r-Adaptive rradiation
During rthe rBeagle rjourney, rDarwin rvisited rislands, rallowing rhim rto rcompare risland
rspecies rwith rcontinental rspecies. rIn rterms rof rframing rhis rtheory rof revolution, rwhy
rwas rthis rsignificant? r- rcorrect ranswers r-Because rthe risland rspecies rhad rboth
rsimilarities rto rtheir rcontinental rancestors rand runique radaptations rto rtheir risland
renvironments.
Which rscenario rbest rillustrates rthe rprocess rof rnatural rselection? r(See rimage rto
rright) rThese r3 rbreeds rof rdogs rare rthe rresult rof r- rcorrect ranswers r-artificial
rselection r( rselective rbreeding)
SOLUTIONS
The rhuman rblood rtype rAB rin rwhich rboth rthe rA rantigen rand rthe rB rantigen rare
rfound rembedded rin rthe rblood rcells ris ran rexample rof r- rcorrect ranswers r-
Codominance
An rX-linked rgene ris r- rcorrect ranswers r-a rgene ron rthe rX rchromosome
, A rman rand ra rwoman rare rboth rheterozygous rcarriers rfor rthe rrecessive rallele rthat
rcauses rcystic rfibrosis. rWhat ris rthe rprobability rthat rthey rwill rhave ran roffspring rwho
rhas rcystic rfibrosis? r- rcorrect ranswers r-25%
All rthe roffspring rof ra rcross rbetween ra rred-flowered rplant rand ra rwhite rflowered
rplant rhave rpink rflowers. rThis rmeans rthat rthe rallele rfor rred rflowers ris r_______ rto
rthe rallele rfor rwhite rflowers. r- rcorrect ranswers r-incompletely rdominant
The rorigin rof rmitochondria rin ra reukaryotic rcell ris rexplained rby r- rcorrect ranswers r-
Endosymbiosis rof ran raerobic rbacterium
Which rwould rbe rmost rlikely rto rbe rfossilized? r- rcorrect ranswers r-a rcommon rthick-
shelled rcrustacean
You runcovered ra rfossil rthat ryou rsuspect ris raround r100 rmillion ryears rold. rWhich rof
rthe rradioisotope rpairs rin rthe rtable rcould ryou reliminate ras ran rappropriate rchoice rfor
rradioisotope rdating rthe raccompanying rrock? r- rcorrect ranswers r-Carbon-14/Nitrogen-
14
The rEarth's ratmosphere rhas rchanged ra rlot rover rthe rpast r4 rbillion ryears. rOne rbig
rchange rwas rdue rto rphotosynthetic rorganisms. rTheir rphotosynthesis rincreased rthe
ramount rof rwhat ratmospheric rgas? r- rcorrect ranswers r-Oxygen r(O2)
The rfirst rliving rcells rwere rmost rlikely r- rcorrect ranswers r-Anaerobic rprokaryotes
The rprocess rby rwhich rthe rmajor rland rmasses rhave rshifted rtheir rpositions, rchanged
rshapes rand rseparated rfrom reach rother, ris rknown ras r- rcorrect ranswers r-
Continental rdrift r(plate rtectonics)
The rlikelihood rof rallopatric rspeciation rincreases rwhen ra rsplinter rpopulation ris
r__________ rand r__________ rthe rbroader rrange rof rthe rspecies. r- rcorrect ranswers
r-Small r; risolated rfrom
Today rthere rare r54 rdifferent rhoneycreepers rin rHawaii. rThe rancestor rof rthe
rhoneycreepers rwas rthe rEuropean rrosefinch. rThe revolution rof rmany rspecies rof
rhoneycreeper ris rthe rresult rof r- rcorrect ranswers r-Adaptive rradiation
During rthe rBeagle rjourney, rDarwin rvisited rislands, rallowing rhim rto rcompare risland
rspecies rwith rcontinental rspecies. rIn rterms rof rframing rhis rtheory rof revolution, rwhy
rwas rthis rsignificant? r- rcorrect ranswers r-Because rthe risland rspecies rhad rboth
rsimilarities rto rtheir rcontinental rancestors rand runique radaptations rto rtheir risland
renvironments.
Which rscenario rbest rillustrates rthe rprocess rof rnatural rselection? r(See rimage rto
rright) rThese r3 rbreeds rof rdogs rare rthe rresult rof r- rcorrect ranswers r-artificial
rselection r( rselective rbreeding)
