I just have a horrible feeling about these exams. My teacher said these exams differentiate between triple and double students so it has to be difficult. I'm just hoping, thats a loada crap from
her.
Unit 4 - die!!!!!

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Reply 67

Jina

OP

2

Can someone help me on tigers? And intensive farming? :/

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Reply 68

Jlendon

Even if I wanted to revise I feel soo ill , which is probably nerves from the fact that I don't know anything ! I hate exams , I can't sleep when I have exams , I get ill and I fail :/

Reply 69

18RA41M

Hey guys.
Are genetic fingerprinting and screening categorised under genetic testing?
And do we need to know the processes of each?

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Reply 70

Jina

OP

2

Original post by 18RA41M

Hey guys.
Are genetic fingerprinting and screening categorised under genetic testing?
And do we need to know the processes of each?

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What's the difference between the two? :frown:

I think you just need to know the genetic testing process....

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Reply 71

Jlendon

Original post by Jina

What's the difference between the two? :frown:

I think you just need to know the genetic testing process....

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Yeah I thought you only needed to know the stages of genetic process

Reply 72

Jina

OP

2

Original post by Jlendon

Yeah I thought you only needed to know the stages of genetic process

Hmm what even is the difference between genetic fingerprinting and screening?
Is fingerprinting the probe thing? And screening the electrophoresis?

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Reply 73

Jlendon

Original post by Jina

Hmm what even is the difference between genetic fingerprinting and screening?
Is fingerprinting the probe thing? And screening the electrophoresis?

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On the specification it just says
1 isolation of DNA sample
2 production of gene probe labelled with fluorescent chemical
3 addition of the labelled gene probe to the DNA sample
4use of uv to detect the marker and indicate the position of the gene/presence of a specific allele in the DNA sample.

so I guess that's all you need to know ?
i don't have a clue what electrophoresis is ? Help me !

Reply 74

Jina

OP

2

Original post by Jlendon

On the specification it just says
1 isolation of DNA sample
2 production of gene probe labelled with fluorescent chemical
3 addition of the labelled gene probe to the DNA sample
4use of uv to detect the marker and indicate the position of the gene/presence of a specific allele in the DNA sample.

so I guess that's all you need to know ?
i don't have a clue what electrophoresis is ? Help me !

Ah ok! Thanks!

As far as I know, electrophoresis is when you separate DNA so that they show up as fluorescent bands and you can compare them.

So you basically place the PCR products on a gel which has an electric field. DNA is negatively charged so it moves towards the anode. Fragments of DNA move at different rates, according to their size (so bigger fragments move slower) and this is how they get separated into bands (fragments of same size). Fluorescent markers then allow us to see this. Each persons DNA gives a different pattern of bands and people who are related have similar bands. Obviously if you're
Comparing suspects to a killer... One suspect will have identical bands to killer's DNA.

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