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A level Biology: Post your doubts here!

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lagta hai ki ham dono ko hi bio ata he,
Hybrid DNA means the DNA with a Strand of N14 and N15 both
When once divided both DNA are hybrid meaning 100% hybrid DNA.
When once more allowed to grow in N14, 2 are hybrid DNA (having both N14 & N15 strands) and 2 are non hybrid ( those which have both same N14 strand). So this has 50 % hybrid DNA. thus answer is B
 
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Hybrid DNA means the DNA with a Strand of N14 and N15 both
When once divided both DNA are hybrid meaning 100% hybrid DNA.
When once more allowed to grow in N14, 2 are hybrid DNA (having both N14 & N15 strands) and 2 are non hybrid ( those which have both same N14 strand). So this has 50 % hybrid DNA. thus answer is B
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