Percentage of Original DNA genetics question

[virtualmaster999]

Hi all!

Quick question on this:

So in Destroyer, the question states "what percent of the double stranded dna contains the original dna after 4 rounds?"

So 4 rounds....2^4=16. And then 2/16 possible so 1/8=.125. Easy.

Then I hit a similar question from QVault:

Double stranded DNA goes through 6 rounds of self-replication. What fraction of the total genetic material produced is composed of the original DNA?

Answer is 1/64.

Im not sure why/ how. I did 2^6=64. 2/64=1/32.

Isnt this the same concept??

Could someone give me a hand here?

Thanks in advance! much appreciated!

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[cdp1210]

Tricky wording here. What percent of the double stranded DNA means how many of the total DNA strands contain the original. 16 total double stranded DNA and 2 of the 16 contain the original so 1/8. You understand that though.

What fraction of the total genetic material produced is different. Basically think of that as the number of single stranded DNA produced. So if it was 4 rounds you would produce a total of 32 DNA strands so the fraction composed of the original DNA would be 2/32 or 1/16 (not 1/8). Likewise, the total genetic material produced after 6 rounds would be 128. Fraction composed of original DNA would be 2/128 = 1/64

 

[virtualmaster999]

Tricky wording here. What percent of the double stranded DNA means how many of the total DNA strands contain the original. 16 total double stranded DNA and 2 of the 16 contain the original so 1/8. You understand that though.

What fraction of the total genetic material produced is different. Basically think of that as the number of single stranded DNA produced. So if it was 4 rounds you would produce a total of 32 DNA strands so the fraction composed of the original DNA would be 2/32 or 1/16 (not 1/8). Likewise, the total genetic material produced after 6 rounds would be 128. Fraction composed of original DNA would be 2/128 = 1/64

Ahhh that make sense. It is tricky wording! So whenever it says "total genetic material" just multiply your strands by 2, and the do 2/ total right?

 

[cdp1210]

Ahhh that make sense. It is tricky wording! So whenever it says "total genetic material" just multiply your strands by 2, and the do 2/ total right?

You got it

 

[virtualmaster999]

You got it

Thanks again!

 

[510586]

Isn't it because the first question starts with one strand (original DNA) and the other starts with two (double stranded DNA). So one multiplies to 16 but another to 32?

 

[DAT Destroyer]

Hi all!

Quick question on this:

So in Destroyer, the question states "what percent of the double stranded dna contains the original dna after 4 rounds?"

So 4 rounds....2^4=16. And then 2/16 possible so 1/8=.125. Easy.

Then I hit a similar question from QVault:

Double stranded DNA goes through 6 rounds of self-replication. What fraction of the total genetic material produced is composed of the original DNA?

Answer is 1/64.

Im not sure why/ how. I did 2^6=64. 2/64=1/32.

Isnt this the same concept??

Could someone give me a hand here?

Thanks in advance! much appreciated!

It is a similar concept. In this question, Qvault is asking what percent of the total genetic material has original 2 strands.

They did not ask what percent of the double stranded DNA has the original 2 strands.
So, after 6 rounds of replication, you have 64 double strands (pairs) and 128 strands total, correct?
Two out of those 128 strands are from the original DNA. 2/128= 1/64.

Hope this helps.

 

[virtualmaster999]

It is a similar concept. In this question, Qvault is asking what percent of the total genetic material has original 2 strands.

They did not ask what percent of the double stranded DNA has the original 2 strands.
So, after 6 rounds of replication, you have 64 double strands (pairs) and 128 strands total, correct?
Two out of those 128 strands are from the original DNA. 2/128= 1/64.

Hope this helps.

Much appreciated!!