Transcript spider-goat - Snapshot Science

Activity
2
1
3
Goat A
6
5
4
7
Goat C
Goat D
(adult)
Goat B
9
10
8
Goat D
© Snapshot Science, 2012
Spider image: Fir0002@ wikimedia commons
Plenary
A
F
The nucleus and silk gene is fused
together.
B
The milk of goat D contains the
spider silk protein.
The egg is stimulated to divide to
form an embryo.
G
Goat C gives birth to a transgenic
goat (goat D) - it's DNA contains the
spider silk gene.
C
The egg cell from goat B and nucleus
containing the silk gene are fused.
H
D
The protein is extracted from the milk
and spider silk is formed.
I
An egg cell is taken from goat B and
enucleated.
E
A body cell is removed from goat
A and the nucleus removed
(enucleation).
© Snapshot Science, 2012
The silk gene is cut out of the
spider's DNA.
J
The embryo is put into the uterus of
goat C.
Plenary
1. What similarities are there between this process and adult
cell cloning?
2. Are any of the goats clones? Explain your answer.
3. In the process a piece of DNA called a promoter is added to
the start of the spider silk gene. This ensures that the gene
is only expressed in the mammary gland cells of the goat.
Why is this important?
4. Outline the ethical, economic and social arguments for and
against this process.
© Snapshot Science, 2012