700 600 500 400 300 200 100 30 10 ||| MW III-1 III-2 IV-1 E1 E2 E3 E4 E5 E6 MW= molecular weight markers in basepairs dotted lines indicate the different lanes of the gel 1. autosomal dominant 2. X-linked dominant What type of trinucleotide repeat disease is Adams syndrome most likely to be? If implanted, which embryo is most likely to produce a blind baby? 3. Y-linked dominant 4. autosomal recessive 5. X-linked recessive 6. E1 7. E2 Which embryo is homozygous for the wild- 8. E3 type adams gene and 9. E4 should be used for implantation? 10. E5 What is the mode of inheritance for Adams syndrome? 11. E6 12. A polyQ trinucleotide repeat 13. disease A non-polyQ trinucleotide repeat disease

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700
600
500
400
300
200
100
30
10
MW
|||
E1 E2 E3 E4 E5 E6
What type of
trinucleotide repeat
disease is Adams
syndrome most likely to
be?
If implanted, which
embryo is most likely to
produce a blind baby?
1. autosomal dominant
3.
2. X-linked dominant
MW= molecular
weight markers in
basepairs
dotted lines indicate
the different lanes of
the gel
Y-linked dominant
4. autosomal recessive
6. E1
5. X-linked recessive
7. E2
Which embryo is
homozygous for the wild- 8. E3
type adams gene and
9. E4
should be used for
implantation?
What is the mode of
inheritance for Adams
syndrome?
10. E5
13.
11. E6
12. A polyQ trinucleotide repeat
disease
A non-polyQ trinucleotide repeat
disease
Transcribed Image Text:700 600 500 400 300 200 100 30 10 MW ||| E1 E2 E3 E4 E5 E6 What type of trinucleotide repeat disease is Adams syndrome most likely to be? If implanted, which embryo is most likely to produce a blind baby? 1. autosomal dominant 3. 2. X-linked dominant MW= molecular weight markers in basepairs dotted lines indicate the different lanes of the gel Y-linked dominant 4. autosomal recessive 6. E1 5. X-linked recessive 7. E2 Which embryo is homozygous for the wild- 8. E3 type adams gene and 9. E4 should be used for implantation? What is the mode of inheritance for Adams syndrome? 10. E5 13. 11. E6 12. A polyQ trinucleotide repeat disease A non-polyQ trinucleotide repeat disease
Shown below is a pedigree for a completely penetrant trait called Adams
syndrome in which babies are born blind. This trait occurs when an allele of
the adams gene is associated with ≥200 tandem trinucleotide repeats (the
normal number is 10). First cousins, III-1 and III-2 married and their first child
(IV-1) was blind. For their next child, they decided to do in vitro fertilization with
III-1's sperm and III-2's eggs to generate six embryos (labeled E1-6). When
each embryo contained eight cells, a single cell was removed and genomic
DNA was isolated. PCR reactions using primers that flank the trinucleotide
repeat region were then performed and the resulting fragments were
fractionated on an agarose gel. PCR reactions using genomic DNA from III-1,
III-2 and IV-1 were included as controls. The DNA was visualized using a
fluorescent dye and the gel is shown below.
Based on this information, select the best answer from the list to the questions
below.
||
E1 = embryo 1
IV
E1
E2 E3 E4 E5
E6
Agarose gel of PCR fragments generated using genomic DNA and
primers flanking the trinucleotide repeat region
Transcribed Image Text:Shown below is a pedigree for a completely penetrant trait called Adams syndrome in which babies are born blind. This trait occurs when an allele of the adams gene is associated with ≥200 tandem trinucleotide repeats (the normal number is 10). First cousins, III-1 and III-2 married and their first child (IV-1) was blind. For their next child, they decided to do in vitro fertilization with III-1's sperm and III-2's eggs to generate six embryos (labeled E1-6). When each embryo contained eight cells, a single cell was removed and genomic DNA was isolated. PCR reactions using primers that flank the trinucleotide repeat region were then performed and the resulting fragments were fractionated on an agarose gel. PCR reactions using genomic DNA from III-1, III-2 and IV-1 were included as controls. The DNA was visualized using a fluorescent dye and the gel is shown below. Based on this information, select the best answer from the list to the questions below. || E1 = embryo 1 IV E1 E2 E3 E4 E5 E6 Agarose gel of PCR fragments generated using genomic DNA and primers flanking the trinucleotide repeat region
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