Question

	Heavy Isotopic DNAs ${(}^{15}N{H}_4)$	Light DNAs $\left(14N{H}_4\right)$	Hybrid DNAs ${(}^{15}N{H}_4+14N{H}_4)$
I	2	0	6
II	0	6	2
III	2	4	2
IV	2	2	4

Heavy DNA (${}^{15}N{H}_4$ labeled) is transferred to ${}^{1}4N{H}_{4}Cl$ medium and allowed to undergo replication by semi conservative method for three generations. After the completion of replication, the data is given in the table.
The correct combination is

• A. l, ll
• B. ll, lV
• C. ll only
• D. lll only

Answer 1

The correct option is B ll, lV

When one Heavy DNAs is transferred to Light DNAs medium than in the First generation, 2 Hybrid Heavy DNAs are formed, In the second generation again 2 hybrid DNA formed.

Similarly, When two heavy DNAs is transferred to Light DNAs medium then 4 hybrid DNA formed in each generation.

So, the correct hybrid DNAs in IV${}^{th}$ experiment only.