investigatory project biology

7/25/2019 Investigatory Project Biology

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INVESTIGATORY PROJECT

BIOLOGY

NAME: TUSHAR GAUTAM

CLASS: 12THA

ROLL NO.: 13

SCHOOL: R.P.V.V. SEC-10 DWARKA NEW DELHI-11007


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DNA Fingerprinting

Unless they are identical twins, individuals haveunique DNA

DNA !"#$%&'&"#("#$

The name used for the unamiguous identifying techniquethat ta!es advantage of differences in DNA sequence

The process of DNA fingerprinting egins y isolatingDNA from

lood, semen, vaginal fluids, hair roots, s!in, s!eletalremains, or elsewhere

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"olymerase #hain $eaction %"#$&

'f there is only a small amount of DNA availale for DNA

Fingerprinting

augment the amount of DNA using a

technique called PCR

PCR is doing DNA replication in a test

tube


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Template

and coolto anneal

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Primer

PrimerTemplate

Like ALL DNApolymerases 53

Taq polymerase canonly add to the 3 end

of an existing

nucleotide

A DNA primer that is

complementary to the

template is used to

supply that 3 end

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DNA Fingerprinting

After we isolate the DNA and amplify it with "#$ Treat the DNA with &%)(&"*("+# %#,%)

cut DNA at specific sequences

(veryone)s DNA is different, so everyone)s DNA will cut at different sites

This results in different si*ed fragments

The different si*ed fragments are called &%)(&"*("+# !&/$%#(%#$( '++&'")), or RLP)

+e can oserve the different si*ed fragments in an eperiment

that separates DNA ased on fragment si*e called -el(lectrophoresis


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$F." Analysis

(veryone has geneticsequences called/&"/4% #54%&

(/#6% &%'%/(), orVNTR)

(veryone has differentamounts of /NT$s

The /NT$s ma!e the

different si*ed $F."s

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-el (lectrophoresis

Fragments of DNA from restriction en*yme cleavageare separated from each other when they migratethrough a support called an /$/&+)% $%

't is similar to the yummy food 0ell12 gelatin

't is actually made out of some of the same ingredients

The si*e1ased separation of 3olecules of DNAseparate ased on si*e when an electric current isapplied to an agarose gel

This is $% %%*(&+'+&%)")

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-el (lectrophoresis

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-el (lectrophoresis

The separated DNA fragments are then drawn out of

the gel using a nylon memrane

The nylon memrane is treated with chemicals that

rea! the hydrogen onds in DNA and separate thestrands

The single stranded DNA is cross lin!ed to the nylonmemrane

4y heat or U/ light

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-el (lectrophoresis

'ncuate the nylon memrane with a radioactive '&+4%of single stranded DNA complementary to the

/NT$s

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-el (lectrophoresis

-el (lectrophoresis

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The radioactive proe shows up on photographicfilm

4ecause as it decays it gives off light

The light leaves a dar! spot on the film

Different individuals have different patterns ofands these ma!e up the fingerprint

-el (lectrophoresis

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This rotocol is kno!n as "outhern #lotting5outhern 4lotting

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DNA Fingerprinting

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DNA fingerprints can e used to determine whichone fragments elong to which individual

DNA Fingerprinting

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DNA fingerprints of children should e similar to the thoseof parents

DNA fingerprinting can show which individuals are theparents of specific children

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Northern 4lot Analysis

Northern lotting analy*es $NA much the sameway that 5outhern lotting does DNA6

$NA is etracted from the cell, undergoes gelelectrophoresis, and is ound to a filter7

8yridi*ation etween ound cellular $NA and a laeledproe occurs7 The si*es of the $NA fragments detectedy the proe can e determined

Northern 4lot Analysis

Northern lot analysis is used for determining6

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The si*e%s& of m$NA encoded y a gene7 Northern lotshave shown that different m$NA species arise from the

same region of DNA, suggesting differential use ofpromoters and terminators, and9or alternative m$NAprocessing7

+hether a specific m$NA is present in a cell type, and ifso, at what levels7 -ene activity is measured in this way,

and $NA sampling is widely used to study development,tissue speciali*ation, or the response of cells to variousphysiological stimuli7

"roducing $ecominant "roteins

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The first step in the production of rBGHprotein %or insulin&is

to transfer the BGHgene %or human insulin gene& from the nucleus ofa cow cell %or human cell& into a acterial cell

8ow do we do that::::

; steps are involved in turning a cow BGHgene into arecominant 4-8 %r4-8& gene in a acterial cell

rBGHgene means that this product is genetically engineered

with the rindicating recominant

"roducing $ecominant "roteins

< steps are involved in turning a cow BGHgene into arecominant 4-8 %r4-8& gene in a acterial cell

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1. 3a!e lots of copies of the cow 4-8 gene in the la in atest tue

2. #ut cow 4-8 gene with restriction en*ymes

3. 'nsert this cow 4-8 gene into acterial DNA = r4-8

4. 'n>ect the acterial DNA containing the r4-8 into acteria

5. -row up lots of these genetically engineered acteria andpurify the r4-8 cow protein they are ma!ing

C+#"#$ / G%#% U)"#$ B/*(%&"/

5tep ?7 3a!e lots of copies of the 4-8 -ene

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Use "#$ to amplify only the cow 4-8 gene fromthe cow chromosomes

$ememer, "#$ is >ust replicating DNA in thelaoratory in a test tue

(nd up with lots and lots of copies of the cow 4-8gene DNA in a test tue

#loning a -ene Using 4acteria

5tep @7 "repare the cow 4-8 -ene for inserting intoacterial DNA

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The cow 4-8 gene ends are sliced using&%)(&"*("+# %#,%)

$estriction en*ymes cut DNA only at specificsequences that leave the doule1stranded DNA>agged or stic!yB on the ends

$estriction en*ymes cut the DNA in a staggered

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pattern, leaving sticky ends

Restrictin en!"#e c$t

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Fig. 16.2Examples of how

differentrestriction

enzymes cleaveDNA

eter !. "#ssell$ iGenetics% &opyright ' earson Ed#cation$ (nc.$p#)lishing as *en+amin mmings.

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5tep ;7 'nsert the BGH-ene into the 4acterial"lasmid

The acterial plasmid is also cut with the restrictionen*yme, leaving stic!y ends

A plasmid is a small circular DNA that is separate fromthe acterial genome

5tic!y ends of the cut 4-8 DNA attach ycomplementary ase pairing to the stic!y ends of

the cut plasmid DNA

This is now recominant DNA

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Fig. 16.,&leavage of DNA )y the restriction enzyme Eco"(

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eter !. "#ssell$ iGenetics% &opyright ' earson Ed#cation$ (nc.$ p#)lishing as *en+amin mmings.

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5tep C7 'nsert the $ecominant "lasmid into a 4acterial #ell The recominant plasmid containing the r4-8 is then placed into

acterial cells

5tep


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TaDa $ecominant proteins

C+#"#$ / G%#% U)"#$ B/*(%&"/

8ow can acteria produce the cow 4-8 protein:

This wor!s ecause acteria use the same geneticcode as cows %and all living things&

2ther proteins are made in this way6

'nsulin for diaetics

#lotting factors for hemophiliacs

#ancer treatment drugs


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Using the lacEgene as areporter of

geneepression

$eporter gene proteinencoding genewhose

epression in

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the cell is quantifiale y techniques of proteindetection7

Fusion of reporter gene to cis acting %DNA&regulatory regions %li!e promoters& allowsassessment gene activity y monitoring amount of

reporter gene product

$%&@

Fusion used to perform genetic studies of the regulatory regionof gene G

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$%&@H

'ig( )*()+ a

#loning is -enetic (ngineering

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C+#"#$is the ma!ing of entire organisms usinggenetic engineering

8as een done in cattle, goats, mice, cats, pigs,raits, and sheep

8as never een done in humans

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Dolly the sheep was the first animal to e cloned

The DNA %all CI chromosomes& from an adult sheep mammary glandwere fused with an unfertili*ed egg cell without any DNA inside

The treated egg was placed in the uterus of an adult sheep that had received hormone treatments to support pregnancy

There were @JJ failures efore this #5*%/& (&/#)!%&techniquesucceeded

Dolly was successfully created in ?HHJ

#loning is-enetic

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(ngineering

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Dolly was put to sleep at the age of I in @KK; 4ecause of health prolems

5he was suffering from arthritis and a progressive lung disease

These are usually only seen in old sheep

#loned animals seem to age prematurely and show signs ofother health prolems that are normally associated withaging

8ypothesis6

(gg and 5perm DNA is reprogrammedB and does not reflect the age of theparents

Adult donor DNA is not reprogrammedB in the egg and reflects the age of thedonor

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Using adult DNA to create new organisms results in organisms that remain atthe age of their donor DNA at irth

Therapeutic #loning Not cloning of entire organisms, ut cloning of specific

tissues or cells

"ancreatic cells to produce insulin in diaetics

5pinal cord cells in paralli*ed patients

S(% *%)are induced in the laoratory to turn into specifictissue cells

+hat are 5tem #ells:

#ells that can e induced to turn into every type of cell in the humanody

+here are 5tem #ells found: 'n emryos

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The original fertili*ed egg grows into an entire human eing7 Thesecells can ma!e every cell type

(mryonic 5tem #ells

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http699sps7!?@7ar7us9massengale9images9ivf7>pg

5tem #ells40


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8ow do scientists acquire 5tem #ells:

8uman eggs are fertili*ed y human sperm in vitro

%in a test tue&

Fertili*ed egg grows and divides y mitosis to anemryo which is >ust a all of cells at this point

These cells can now e fro*en as stem cells for research

This is the same process that is used y couplesthat cannot conceive a ay

#alled in vitro fertili*ation %'/F&

'/F

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in vitro fertili*ation %'/F&

The all of cells is implanted into the female)s uterus

5he has een treated with hormones to simulate pregnancy to accept

the emryohttp699pregnancyanday7com9pregnancy9ay9Facing1infertility1


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#ouples using '/F generally generate ?ust grow as individual stem cells

$esearchers can grow millions and millions of these in the la to perform studies thatmay someday save lives and cure diseases

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#ell 5tage(mryonic

5tem #ells

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5tem #ells

The use of emryonic stem cells in research fuels aheated national deate

3ostly ecause of scientific ignorance

(mryonic stem cells are valued y researchers

ecause they are (+("'+(%#(, or ale to ecome anyother cell

+ith increased study, these could potentially treat or cureany type of disease and cancer

'n @KK?, "resident 4ush anned federal funding forreaching using emryonic stem cells

4ecause he never too! 4io ;IK

%or any iology for that matter&45

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