A culture of bacteria had all its DNA labelled with the heavy isotope of nitrogen, ${}^{15}N$. The culture was then allowed to reproduce using nucleotides containing normal ${}^{14}N$. The DNA was examined using a centrifuge after one generation and again after two generations.
The diagram shows the position of the DNA band at Z in the centrifuge tube when the DNA was first labelled.
In which pattern would the DNA be found after the first and after the second cell generations?
1 )
A
2 )
B
C
4 )
D
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