idk__21
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Can someone help with these questions/ check my answers are correct?

There are 3 billion bases in human DNA.
60 million bases make up the exons.

1)Calculate the percentage of human DNA which make up codons.
I got 33.3 % because i divided the 3 billion bases in human DNA by 3. ( not sure if this is right but does dividing the total number of bases in human DNA by 3 give us the number of codons?) I got 1 billion codons and then divided that by 3 billion and then multiplied by 100??

2)how many bases are there that make up the junk DNA?
2940000000 because I did 3 billion - 60 million

3)what percentage of human DNA is introns?
3 billion-60 million= 2940000000/3 billion X100= 98%
Last edited by idk__21; 1 month ago
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Hellllpppp
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1. I don’t think this is asking about the number of codons as a percentage of total bases. I think instead you need to think about if codons include introns or just exons and use that to work out the percentage.

2 and 3 look right to me.
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Hellllpppp
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I forgot to add codons are found on mRNA - I don’t know if this means you have to halve it (I don’t think it would but I’m tired).
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idk__21
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(Original post by Hellllpppp)
1. I don’t think this is asking about the number of codons as a percentage of total bases. I think instead you need to think about if codons include introns or just exons and use that to work out the percentage.

2 and 3 look right to me.
yeah so for q1 what calculation could we do sorry but im lost
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Hellllpppp
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(Original post by Amnar_1)
yeah so for q1 what calculation could we do sorry but im lost
I think it’s 60 million/ 3 billion x 100
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Wannabevetnurse
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(Original post by Amnar_1)
yeah so for q1 what calculation could we do sorry but im lost
60 million/3 billion x 100
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idk__21
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(Original post by Hellllpppp)
I think it’s 60 million/ 3 billion x 100
right that makes sense thank you!!
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