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OCR A-Level Biology Cloning Summary

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Handwritten Summary by an Oxford Medical Student which covers all content necessary for an A* in Cloning at OCR Biology A-Level.

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Natural Asexual reproduction
Cloning
:




-

Bulbs-Runners-Rhizomes -
Stem tubers

Sugar Cane :




"Make a cut in a non-flowering stem and remove some leaves

-Use a hormone
rooting powder
3
keep Cutting well watered and cover with a plasticbag
micropropogation :



↳ used when plants do not produce many seeds ,
is
very rare ,
is
genetically modified with difficulty
1 .

Take a small sample of meristem tissue

.
2
Sterilise it
.
3
Place it in a Sterile Culture medium with hormones to form a calus (mass of identical (ens)
4
be mediums and
spread to genetically identical
.
Cell Clumps can new culture will plant lets
grow
3
Plantlets are transferred to proper growth
.




compost to allow


Benefits of micropropogation :


·

Rapid production and high yield Disease free plants Seedless fruits .
Grow rare or sterile plants
Drawbacks of micropropogation :




monoculture Expensive and complex ·
Vulnerable to mould .
Disease will affect an clones produced



Cloning in invertibrates :
Limb
regeneration and done production
in vertibrates
Cloning Monozygotic twins
:




Artificial twinning Often used to produce optimal :




offspring in livestock

.
Eggs are removed and fertilised ,



2 .

Totipotent embryo ceus can then be split to form several identical embryos
.
3 The embryos are then implanted into
surrogate mothers
Somatic cell nuclear transfer Produces an identical
:

clone of an adult
organism
.
1
cell of desired animal is fused envocated egg cen with
with an an electrical pulse
embryo and be carried to term by a surrogate
2 This will develop into an mother
.

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Uploaded on
October 11, 2023
Number of pages
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Written in
2023/2024
Type
Summary
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