IB 150 EXAM 2: PRACTICE EXAM QUESTIONS AN
ANSWERS
Which cof cthe cfollowing cis ctrue cabout cboth cof cthe cfollowing cmutations:
-a csubstitution cthat ccauses ca cnonsense cmutation
-a cthree-nucleotide cinsertion cmutation c- cCORRECT cANS✔✔a. cboth cchange cthe clength cof cthe c
csequence, crelative cto cthe cproduct cof cthe cunmutated cDNA csequence
Original cmRNA csequence: cAUGUAUUGGCCU
New cmRNA csequence: cAUGUAUCGGCCU
c
This cmutation cwould cbe cclassified cas ca c_____________________ cmutation. c- cCORRECT cANS
Which cof cthe cfollowing caccurately cdescribes cthe cprocesses cthat ccan ccreate ccombinations cof ca
cthat cwere cnot cpresent cin cthis cindividual's cparents? c- cCORRECT cANS✔✔crossing cover cbut cno
Recombination cof calleles cis ccaused cby cthe cexchange cof cgenetic cmaterial cbetween c_________
cANS✔✔non-sister cchromatids cof chomologous cchromosomes
Which cof cthe cfollowing cdiagrams ccorrectly clabels cthe calleles cof ca cdiploid corganism cthat cis chet
cB cand cC)? c- cCORRECT cANS✔✔(heterozygous calleles con csame cgene)
The chuman cABO cblood cgroup cis ccontrolled cby ca csingle cautosomal cgene cwith cthree calleles, cIA
ceither cthe cIAIA cor cIAi cgenotypes chave cblood ctype cA; cthose cwith cIB cIBor cIBi chave cblood ctype
cblood ctype cAB; cand cthose cwith cii chave cblood ctype cO.
Imagine ca cmother cwith ctype-A cblood, cand ca cfather cwith ctype-B cblood chave ca cbaby cwith ctype-
cprobability cthat cany cgiven cchild cof cthis ccouple cwill chave ctype-O cblood? c- cCORRECT cANS✔✔
In ca cspecies cof cmouse, cthere care ctwo calleles c(A1 cand cA2) cof ca csingle cgene cthat ccontrol ccoa
cwhite ccoats, cA1A2 cindividuals chave cbrown ccoats, cand cA2A2 cindividuals chave cblack ccoats. cA
cproduce c12 coffspring. cHow cmany cof cthose coffspring cdo cyou cexpect cto cbe cbrown? c- cCORREC
A cspecies cof cmice ccan chave cgray cor cblack cfur cand clong cor cshort ctails. cMany ccrosses cbetwee
cmice cand cgray-furred, cshort-tailed cmice call cproduce cblack-furred, clong-tailed coffspring. cHow cm
cfound camong cthe cgametes cof cthe cblack-furred, clong-tailed cP1 cmice c(i.e., cthe coriginal cparents)
Imagine cGenes cA cand cB care clinked con cone cchromosome ctype, cand cGenes cC cand cD care clink
cindividual cheterozygous cat call cfour cgenes c(i.e., cAaBbCcDd), chow cmany cdistinct cgamete cgenot
cindividual? c(Ignore cmutation cand ccrossing-over.) c- cCORRECT cANS✔✔4
ANSWERS
Which cof cthe cfollowing cis ctrue cabout cboth cof cthe cfollowing cmutations:
-a csubstitution cthat ccauses ca cnonsense cmutation
-a cthree-nucleotide cinsertion cmutation c- cCORRECT cANS✔✔a. cboth cchange cthe clength cof cthe c
csequence, crelative cto cthe cproduct cof cthe cunmutated cDNA csequence
Original cmRNA csequence: cAUGUAUUGGCCU
New cmRNA csequence: cAUGUAUCGGCCU
c
This cmutation cwould cbe cclassified cas ca c_____________________ cmutation. c- cCORRECT cANS
Which cof cthe cfollowing caccurately cdescribes cthe cprocesses cthat ccan ccreate ccombinations cof ca
cthat cwere cnot cpresent cin cthis cindividual's cparents? c- cCORRECT cANS✔✔crossing cover cbut cno
Recombination cof calleles cis ccaused cby cthe cexchange cof cgenetic cmaterial cbetween c_________
cANS✔✔non-sister cchromatids cof chomologous cchromosomes
Which cof cthe cfollowing cdiagrams ccorrectly clabels cthe calleles cof ca cdiploid corganism cthat cis chet
cB cand cC)? c- cCORRECT cANS✔✔(heterozygous calleles con csame cgene)
The chuman cABO cblood cgroup cis ccontrolled cby ca csingle cautosomal cgene cwith cthree calleles, cIA
ceither cthe cIAIA cor cIAi cgenotypes chave cblood ctype cA; cthose cwith cIB cIBor cIBi chave cblood ctype
cblood ctype cAB; cand cthose cwith cii chave cblood ctype cO.
Imagine ca cmother cwith ctype-A cblood, cand ca cfather cwith ctype-B cblood chave ca cbaby cwith ctype-
cprobability cthat cany cgiven cchild cof cthis ccouple cwill chave ctype-O cblood? c- cCORRECT cANS✔✔
In ca cspecies cof cmouse, cthere care ctwo calleles c(A1 cand cA2) cof ca csingle cgene cthat ccontrol ccoa
cwhite ccoats, cA1A2 cindividuals chave cbrown ccoats, cand cA2A2 cindividuals chave cblack ccoats. cA
cproduce c12 coffspring. cHow cmany cof cthose coffspring cdo cyou cexpect cto cbe cbrown? c- cCORREC
A cspecies cof cmice ccan chave cgray cor cblack cfur cand clong cor cshort ctails. cMany ccrosses cbetwee
cmice cand cgray-furred, cshort-tailed cmice call cproduce cblack-furred, clong-tailed coffspring. cHow cm
cfound camong cthe cgametes cof cthe cblack-furred, clong-tailed cP1 cmice c(i.e., cthe coriginal cparents)
Imagine cGenes cA cand cB care clinked con cone cchromosome ctype, cand cGenes cC cand cD care clink
cindividual cheterozygous cat call cfour cgenes c(i.e., cAaBbCcDd), chow cmany cdistinct cgamete cgenot
cindividual? c(Ignore cmutation cand ccrossing-over.) c- cCORRECT cANS✔✔4
