Multiple Choice: DARKEN the letter that
best completes the statement or answers the question.
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The pedigree below shows a family’s pedigree for Huntington’s
disease.
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1.
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Which family members are afflicted with Huntington’s disease?
A | I-1, II-2, II-3, II-7, III-3 | B | I-2, II-1, II-4, II-6, II-8 | C | II-2, II-3,
III-1 | D | II-3, II-7, II-8, III-4 |
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2.
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There are no carriers for Huntington’s disease. You either have it or you
don’t. With this in mind, what type of inheritance does Huntington’s disease
follow?
A | autosomal recessive | C | sex-linked | B | autosomal dominant | D | codominant |
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3.
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How many children did individuals I-1 and I-2 have?
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4.
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How many girls did II-1 and II-2 have? How many are affected?
A | 2 girls, none with Huntington’s disease | B | 2 girls, one with
Huntington’s disease | C | 3 girls, two with Huntington’s
disease | D | 3 girls, one with Huntington’s disease | E | 3 girls, all with
Huntington’s disease |
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5.
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How are individuals III-2 and II-4 related?
A | daughter and mother | B | nephew and aunt | C | grandson and
grandfather | D | niece and uncle | E | granddaughter and
grandfather |
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6.
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How are individuals I-2 and III-5 related?
A | grandma and granddaughter | D | father and
daughter | B | grandma and grandson | E | mother and daughter | C | mother and son |
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7.
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How many children did individuals I-1 and I-2 have?
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The pedigree below shows a family’s pedigree for colorblindness:
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8.
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Which sex can be carriers of colorblindness and not have it?
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9.
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What kind of trait is colorblindness?
A | autosomal dominant | D | codominant | B | autosomal recessive | E | sex-linked recessive | C | sex-linked
dominant |
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10.
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What is the genotype of individual IV-7?
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11.
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All of the following statements about colorblindness are true, EXCEPT:
A | Males are usually more severely affected than females. The trait may be lethal in
males. | B | Parents of affected children may be related. The rarer the trait in the general
population, the more likely a consanguineous mating is involved. | C | All sons of an
affected male and a normal female are normal. All daughters of an affected male and a normal female
are affected. | D | The trait is never passed from father to son. | E | Matings of affected
females and normal males produce 1/2 the sons affected and 1/2 the daughters
affected. |
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12.
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Why do all the daughters in generation II carry the colorblind gene?
A | Their mother is a carrier with the Xb gene | B | Their dad is affected
with only Xb gene to give to them | C | Their dad is homozygous dominant for the
disorder | D | Their mom is homozygous recessive for the disorder | E | Their mom is
heterozygous for the disorder |
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13.
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Name two fourth generation colorblind males.
A | IV-1 and IV-7 | D | IV-3 and Iv-6 | B | IV-5 and IV-7 | E | IV-1 and IV-5 | C | IV-1 and
IV-3 |
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In the pedigree below, different blood types are identified by the letters A,
B, AB, and O.
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14.
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Individuals II-4 and II-5 have just had identical twin girls. List the possible
blood types these infants may have based on the information provided in the pedigree
A | Types A, B, AB and O | D | Types A and AB | B | Types A and B | E | Type O | C | Types B and
AB |
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15.
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Individuals II-6 and II-7 have a second child with blood type O. What
does this tell you about II-6’s genotype?
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16.
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Could I-1 and I-2 have a child with the AB blood type?
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17.
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Which member of the family can only get blood from a type O donor?
A | I-2 | D | I-4, II-3, II-4, II-6 | B | I-3, II-1, II-2, II-5 | E | the twins | C | I-1 and
II-7 |
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18.
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Which blood type can receive from type A, B, AB and O?
A | type A | C | type AB | B | type B | D | type O |
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Short Answer
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Use the exhibit to answer the questions that follow.
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19.
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What type of chart is shown in Figure 7.4?
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20.
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What do the shaded shapes represent?
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21.
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The phenotype is caused by a dominant allele. Write two statements to support
this fact.
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22.
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The phenotype is caused by an autosomal gene. Explain why.
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23.
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Make a Punnett square using the parental genotypes. Find all the possible
genotypes for the offspring in the F generation.
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