Mendelian Genetics. Figure 14.1 Figure 14.3-1 P Generation EXPERIMENT (true-breeding parents) Purple...
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Transcript of Mendelian Genetics. Figure 14.1 Figure 14.3-1 P Generation EXPERIMENT (true-breeding parents) Purple...
![Page 1: Mendelian Genetics. Figure 14.1 Figure 14.3-1 P Generation EXPERIMENT (true-breeding parents) Purple flowers White flowers.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649ed15503460f94be0878/html5/thumbnails/1.jpg)
Mendelian Genetics
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Figure 14.1
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Figure 14.3-1
P Generation
EXPERIMENT
(true-breedingparents) Purple
flowersWhite
flowers
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Figure 14.3-2
P Generation
EXPERIMENT
(true-breedingparents)
F1 Generation(hybrids)
Purpleflowers
Whiteflowers
All plants had purple flowers
Self- or cross-pollination
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Figure 14.3-3
P Generation
EXPERIMENT
(true-breedingparents)
F1 Generation(hybrids)
F2 Generation
Purpleflowers
Whiteflowers
All plants had purple flowers
Self- or cross-pollination
705 purple-flowered
plants
224 whiteflowered
plants
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Table 14.1
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Figure 14.4
Allele for purple flowers
Locus for flower-color gene
Allele for white flowers
Pair ofhomologouschromosomes
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Figure 14.5-3
P Generation
F1 Generation
F2 Generation
Appearance:Genetic makeup:
Gametes:
Appearance:Genetic makeup:
Gametes:
Purple flowers White flowers
Purple flowers
Sperm from F1 (Pp) plant
Pp
PP pp
P
P
P
P
p
p
p
p
Eggs from F1 (Pp) plant
PP
ppPp
Pp
1/21/2
3 : 1
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Phenotype
Purple
Purple
Purple
White
3
1
1
1
2
Ratio 3:1 Ratio 1:2:1
Genotype
PP(homozygous)
Pp(heterozygous)
Pp(heterozygous)
pp(homozygous)
Figure 14.6
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Figure 14.7
Dominant phenotype,unknown genotype:
PP or Pp?
Recessive phenotype,known genotype:
pp
PredictionsIf purple-floweredparent is PP
If purple-floweredparent is Pp
or
Sperm Sperm
Eggs Eggs
or
All offspring purple 1/2 offspring purple and 1/2 offspring white
Pp Pp
Pp Pp
Pp Pp
pp pp
p p p p
P
P
P
p
TECHNIQUE
RESULTS
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Figure 14.10-1
P Generation
Red White
Gametes
CWCWCRCR
CR CW
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Figure 14.10-2
P Generation
F1 Generation
1/21/2
Red White
Gametes
Pink
Gametes
CWCWCRCR
CR CW
CRCW
CR CW
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Figure 14.10-3
P Generation
F1 Generation
F2 Generation
1/21/2
1/21/2
1/2
1/2
Red White
Gametes
Pink
Gametes
Sperm
Eggs
CWCWCRCR
CR CW
CRCW
CR CW
CWCR
CR
CW
CRCR CRCW
CRCW CWCW
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Figure 14.11
Carbohydrate
Allele
(a) The three alleles for the ABO blood groups and their carbohydrates
(b) Blood group genotypes and phenotypes
Genotype
Red blood cellappearance
Phenotype(blood group)
A
A
B
B AB
none
O
IA IB i
iiIAIBIAIA or IAi IBIB or IBi
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Figure 14.14
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Figure 14.13
Eggs
Sperm
Phenotypes:
Number ofdark-skin alleles: 0 1 2 3 4 5 6
1/81/8
1/81/8
1/81/8
1/81/8
1/8
1/8
1/8
1/8
1/8
1/8
1/8
1/8
1/646/64
15/6420/64
15/646/64
1/64
AaBbCc AaBbCc
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Figure 14.12
Sperm
Eggs
9 : 3 : 4
1/41/4
1/41/4
1/4
1/4
1/4
1/4
BbEe BbEe
BE
BE
bE
bE
Be
Be
be
be
BBEE BbEE BBEe BbEe
BbEE bbEE BbEe bbEe
BBEe BbEe BBee Bbee
BbEe bbEe Bbee bbee
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Figure 14.9
Segregation ofalleles into eggs
Segregation ofalleles into sperm
Sperm
Eggs
1/2
1/2
1/21/2
1/41/4
1/41/4
Rr Rr
R
R
RR
R
R
r
r
r
r r
r
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Figure 14.8
P Generation
F1 Generation
Predictions
Gametes
EXPERIMENT
RESULTS
YYRR yyrr
yrYR
YyRr
Hypothesis ofdependent assortment
Hypothesis ofindependent assortment
Predictedoffspring ofF2 generation
Sperm
Spermor
EggsEggs
Phenotypic ratio 3:1
Phenotypic ratio 9:3:3:1
Phenotypic ratio approximately 9:3:3:1315 108 101 32
1/21/2
1/2
1/2
1/41/4
1/41/4
1/4
1/4
1/4
1/4
9/163/16
3/161/16
YR
YR
YR
YRyr
yr
yr
yr
1/43/4
Yr
Yr
yR
yR
YYRR YyRr
YyRr yyrr
YYRR YYRr YyRR YyRr
YYRr YYrr YyRr Yyrr
YyRR YyRr yyRR yyRr
YyRr Yyrr yyRr yyrr
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Figure 14.UN01
Probability of YYRR
Probability of YyRR
1/4 (probability of YY)
1/2 (Yy)
1/4 (RR)
1/4 (RR)
1/16
1/8
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Figure 14.UN02
Chance of at least two recessive traits
ppyyRr
ppYyrr
Ppyyrr
PPyyrrppyyrr
1/4 (probability of pp) 1/2 (yy) 1/2 (Rr) 1/4 1/2 1/2 1/2 1/2 1/2 1/4 1/2 1/2 1/4 1/2 1/2
1/16
1/16 2/16
1/16
1/16
6/16 or 3/8
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Figure 15.6
Parents
orSperm
or
Egg
Zygotes (offspring)
44 XY
44 XX
22 X
22 Y
22 X
44 XX
44 XY
22 XX
22 X
76 ZW
76 ZZ
32 (Diploid)
16 (Haploid)
(a) The X-Y system
(b) The X-0 system
(c) The Z-W system
(d) The haplo-diploid system
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Figure 15.8
Early embryo:
X chromosomesAllele fororange fur
Allele forblack fur
Two cellpopulationsin adult cat:
Cell division andX chromosomeinactivation
Active XInactive X
Active X
Black fur Orange fur
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Figure 15.7
Eggs Eggs Eggs
Sperm Sperm Sperm
(a) (b) (c)
XNXN XnY XNXn XNY XNXn XnY
Xn Y XN Y YXn
Xn Xn
XN
XN
XN XNXNXn XNY
XNY
XNY XNY
XnY XnYXNXn XNXn
XNXnXNXN
XnXn
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Figure 14.15
Key
Male Female Affectedmale
Affected female
Mating Offspring
1stgeneration
2ndgeneration
3rdgeneration
1stgeneration
2ndgeneration
3rdgeneration
Is a widow’s peak a dominant orrecessive trait?
(a) Is an attached earlobe a dominantor recessive trait?
b)
Widow’speak
No widow’speak
Attachedearlobe
Freeearlobe
FForFfWW
orWw
Ww ww ww Ww
Ww Ww Wwww ww ww
ww
Ff Ff Ff
Ff Ff
ff
ffffffFF or Ff
ff
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Figure 15.3
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Figure 15.4a
All offspringhad red eyes.
PGeneration
F1
Generation
F2
Generation
RESULTS
EXPERIMENT
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Figure 15.4b
F2
Generation
PGeneration
Eggs
Eggs
Sperm
Sperm
Xw
CONCLUSION
XX Y
w
ww w
w
ww w
w
w
w
w
w
ww w
F1
Generation
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Figure 15.9-1P Generation (homozygous)
Wild type(gray body, normal wings)
b b vg vg b b vg vg
Double mutant(black body,vestigial wings)
EXPERIMENT
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Figure 15.9-2P Generation (homozygous)
Wild type(gray body, normal wings)
F1 dihybrid(wild type)
TESTCROSS
b b vg vg
b b vg vg
b b vg vg
b b vg vg
Double mutant(black body,vestigial wings)
Double mutant
EXPERIMENT
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Figure 15.9-3P Generation (homozygous)
Wild type(gray body, normal wings)
F1 dihybrid(wild type)
Testcrossoffspring
TESTCROSS
b b vg vg
b b vg vg
b b vg vg
b b vg vg
Double mutant(black body,vestigial wings)
Double mutant
Eggs
Sperm
EXPERIMENT
Wild type(gray-normal)
Black-vestigial
Gray-vestigial
Black-normal
b vg b vg b vg b vg
b b vg vg b b vg vg b b vg vg b b vg vg
b vg
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Figure 15.9-4P Generation (homozygous)
Wild type(gray body, normal wings)
F1 dihybrid(wild type)
Testcrossoffspring
TESTCROSS
b b vg vg
b b vg vg
b b vg vg
b b vg vg
Double mutant(black body,vestigial wings)
Double mutant
Eggs
Sperm
EXPERIMENT
RESULTS
PREDICTED RATIOS
Wild type(gray-normal)
Black-vestigial
Gray-vestigial
Black-normal
b vg b vg b vg b vg
b b vg vg b b vg vg b b vg vg b b vg vg
965 944 206 185
1
1
1
1
1
0
1
0
If genes are located on different chromosomes:
If genes are located on the same chromosome andparental alleles are always inherited together:
:
:
:
:
:
:
:
:
:
b vg
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Figure 15.10a
Testcrossparents
Replicationof chromosomes
Gray body, normal wings(F1 dihybrid)
Black body, vestigial wings(double mutant)
Replicationof chromosomes
Meiosis I
Meiosis II
Meiosis I and II
Recombinantchromosomes
Eggs
b vg
b vg
b vg
b vg
b vg
b vg
b vg
b vg
b vg
b vg
b vg
b vg
b vg
b vgb vg
b vg
bvg b vgb vg
b vg
Spermb vg
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Figure 15.10b
Testcrossoffspring
965Wild type
(gray-normal)
944Black-
vestigial
206Gray-
vestigial
185Black-normal
Sperm
Parental-type offspring Recombinant offspring
Recombinationfrequency
391 recombinants2,300 total offspring
100 17%
b vg b vgb vgb vg
b vg b vg b vg b vg
b vg
Eggs
Recombinantchromosomes
bvg b vg b vg b vg
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Figure 15.11
Chromosome
Recombinationfrequencies
9% 9.5%
17%
b cn vg
RESULTS
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Figure 15.12
Mutant phenotypes
Shortaristae
Blackbody
Cinnabareyes
Vestigialwings
Browneyes
Long aristae(appendageson head)
Gray body
Red eyes
Normalwings
Redeyes
Wild-type phenotypes
104.567.057.548.50
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Meiosis I
Nondisjunction
Figure 15.13-1
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Meiosis I
Meiosis II
Nondisjunction
Non-disjunction
Figure 15.13-2
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Meiosis I
Meiosis II
Nondisjunction
Non-disjunction
Gametes
Number of chromosomes
Nondisjunction of homo-logous chromosomes inmeiosis I
(a) Nondisjunction of sisterchromatids in meiosis II
(b)
n 1 n 1n 1 n 1 n 1n 1 n n
Figure 15.13-3
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“Normal”Which phase of meiosis is this?
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Nondisjunction
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Figure 15.15
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Figure 15.15b
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Figure 14.19
(a) Amniocentesis (b) Chorionic villus sampling (CVS)
Ultrasound monitor
Amnioticfluidwithdrawn
FetusPlacentaUterus Cervix
Centrifugation
Fluid
Fetal cells
Several hours
Severalweeks
Several weeks
Biochemicaland genetic
tests
Karyotyping
Ultrasoundmonitor
Fetus
Placenta
Chorionic villi
Uterus
Cervix
Suctiontubeinsertedthroughcervix
Several hours
Fetal cells
Several hours
1
1
2
2
3
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Edward’s Syndrome
Clenched fists, small jaw, severe mental handicap, unlikely to survive past 3 months
What causes Edward’s Syndrome?
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Turner’s Syndrome • Short female, most often sterile (infertile), no female development at puberty, no mental retardation
• Treatment with growth hormone (increase height) and estrogen replacement (promote female development)
• No treatment for sterility
What causes Turner’s Syndrome?
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Klinefelter’s SyndromeMale with female secondary sex characteristics (wide hips, breasts, etc…)
Usually tall and slender, no retardation
Usually sterile (cannot reproduce)
What causes Klinefelter’s Syndrome?
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Figure 15.14a
(a) Deletion
(b) Duplication
A deletion removes a chromosomal segment.
A duplication repeats a segment.
BA C D E F G H
A B C D E F G H
A B C D E F G H B C
A B C E F G H
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Figure 15.14b
(c) Inversion
(d) Translocation
An inversion reverses a segment within a chromosome.
A translocation moves a segment from onechromosome to a nonhomologous chromosome.
A B C D E F G H
A D C B E F G H
A B C D E F G H M N O P Q R
GM N O C H FED A B P Q R
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Figure 15.16
Normal chromosome 9
Normal chromosome 22
Reciprocal translocation
Translocated chromosome 9
Translocated chromosome 22(Philadelphia chromosome)
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Cri du Chat Syndrome
Larynx (voicebox) malformed, high pitched voice (cry of the cat), mental handicap
What causes Cri du Chat?
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Living S cells(control)
Living R cells(control)
Heat-killedS cells(control)
Mixture ofheat-killedS cells andliving R cells
Mouse dies Mouse diesMouse healthy Mouse healthy
Living S cells
EXPERIMENT
RESULTS
Figure 16.2
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Figure 16.4-1
Bacterial cell
Phage
Batch 1:Radioactivesulfur(35S)
DNA
Batch 2:Radioactivephosphorus(32P)
RadioactiveDNA
EXPERIMENTRadioactiveprotein
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Figure 16.4-2
Bacterial cell
Phage
Batch 1:Radioactivesulfur(35S)
Radioactiveprotein
DNA
Batch 2:Radioactivephosphorus(32P)
RadioactiveDNA
Emptyproteinshell
PhageDNA
EXPERIMENT
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Figure 16.4-3
Bacterial cell
Phage
Batch 1:Radioactivesulfur(35S)
Radioactiveprotein
DNA
Batch 2:Radioactivephosphorus(32P)
RadioactiveDNA
Emptyproteinshell
PhageDNA
Centrifuge
Centrifuge
Radioactivity(phage protein)in liquid
Pellet (bacterialcells and contents)
PelletRadioactivity(phage DNA)in pellet
EXPERIMENT
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Figure 16.UN04
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Figure 16.6
(a) Rosalind Franklin (b) Franklin’s X-ray diffractionphotograph of DNA
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Figure 16.1
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Figure 16.7b
(c) Space-filling model
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3.4 nm
1 nm
0.34 nm
Hydrogen bond
(a) Key features ofDNA structure
(b) Partial chemical structure
3 end
5 end
3 end
5 end
T
T
A
A
G
G
C
C
C
C
C
C
C
C
C
C
C
G
G
G
G
G
G
G
G
G
T
T
T
T
T
T
A
A
A
A
A
A
Figure 16.7a
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Figure 16.UN01
Purine purine: too wide
Pyrimidine pyrimidine: too narrow
Purine pyrimidine: widthconsistent with X-ray data
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Figure 16.8
Sugar
Sugar
Sugar
Sugar
Adenine (A) Thymine (T)
Guanine (G) Cytosine (C)
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Figure 16.9-3
(a) Parent molecule (b) Separation ofstrands
(c)“Daughter” DNA molecules,each consisting of oneparental strand and onenew strand
A
A
A
A
A
A
A
A
A
A
A
A
T
T
T
T
T
T
T
T
T
T
T
T
C
C
C
C
C
C
C
C
G
G
G
G
G
G
G
G
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Figure 16.10
(a) Conservativemodel
(b) Semiconservativemodel
(c) Dispersive model
Parentcell
Firstreplication
Secondreplication
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Figure 16.11a
Bacteriacultured inmedium with15N (heavyisotope)
Bacteriatransferred tomedium with14N (lighterisotope)
DNA samplecentrifugedafter firstreplication
DNA samplecentrifugedafter secondreplication
Less dense
More dense
21
3 4
EXPERIMENT
RESULTS
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Figure 16.11b
Predictions: First replication Second replication
Conservativemodel
Semiconservativemodel
Dispersivemodel
CONCLUSION
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Figure 16.12a
(a) Origin of replication in an E. coli cell
Origin ofreplication Parental (template) strand
Double-strandedDNA molecule
Daughter (new) strand
Replication forkReplicationbubble
Two daughterDNA molecules
0.5 m
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Figure 16.12b
(b) Origins of replication in a eukaryotic cell
Origin of replicationDouble-strandedDNA molecule
Parental (template)strand
Daughter (new)strand
Bubble Replication fork
Two daughter DNA molecules0.25 m
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Figure 16.13
Topoisomerase
Primase
RNAprimer
Helicase
Single-strand bindingproteins
5
3
5
53
3
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Figure 16.15a
Leadingstrand
Laggingstrand
Overview
Origin of replication Laggingstrand
Leadingstrand
Primer
Overall directionsof replication
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Origin of replication
RNA primer
Sliding clamp
DNA pol IIIParental DNA
3
5
5
33
5
3
5
3
5
3
5
Figure 16.15b
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Figure 16.16a
Origin of replication
Overview
Leadingstrand
Leadingstrand
Laggingstrand
Lagging strand
Overall directionsof replication
12
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Figure 16.16b-1
Templatestrand
3
35
5
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Figure 16.16b-2
Templatestrand
RNA primerfor fragment 1
3
3
3
3
5
5
5
51
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Figure 16.16b-3
Templatestrand
RNA primerfor fragment 1
Okazakifragment 1
3
3
3
3
3
3
5
5
5
5
5
5
1
1
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Figure 16.16b-4
Templatestrand
RNA primerfor fragment 1
Okazakifragment 1
RNA primerfor fragment 2
Okazakifragment 2
3
3
3
3
3
3
3
3
5
5
5
5
5
55
5
2
1
1
1
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Figure 16.16b-5
Templatestrand
RNA primerfor fragment 1
Okazakifragment 1
RNA primerfor fragment 2
Okazakifragment 2
3
3
3
3
3
3
3
3
3
3
3
5
5
5
5
5
55
55
55
2
21
1
1
1
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Figure 16.16b-6
Templatestrand
RNA primerfor fragment 1
Okazakifragment 1
RNA primerfor fragment 2
Okazakifragment 2
Overall direction of replication
3
3
3
3
3
3
3
3
3
3
3
3
5
5
5
5
5
55
55
55
5
2
2
21
1
1
1
1
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Figure 16.17
Overview
Leadingstrand
Origin of replication Lagging
strand
LeadingstrandLagging
strand Overall directionsof replicationLeading strand
DNA pol III
DNA pol III Lagging strand
DNA pol I DNA ligase
PrimerPrimase
ParentalDNA
5
5
5
5
5
33
3
333 2 1
4
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Figure 16.22a
DNA double helix(2 nm in diameter)
DNA, the double helix
Nucleosome(10 nm in diameter)
Histones
Histones
Histonetail
H1
Nucleosomes, or “beads ona string” (10-nm fiber)
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Figure 16.22b
30-nm fiber
30-nm fiber
Loops Scaffold
300-nm fiber
Chromatid(700 nm)
Replicatedchromosome(1,400 nm)
Looped domains(300-nm fiber) Metaphase
chromosome