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Question

In genetic fingerprinting, the 'probe' refers to

A
A radioactively labelled single stranded DNA molecule.
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B
A radioactively labelled single stranded RNA molecule.
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C
A radioactively labelled double stranded RNA molecule.
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D
A radioactively labelled double stranded DNA molecule.
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Solution

The correct option is A A radioactively labelled single stranded DNA molecule.
A probe is a fragment of DNA or RNA of variable length, which is used in DNA or RNA samples to detect the presence of nucleotide sequences that are complementary to the sequence in the probe. The probe thereby hybridizes to single-stranded nucleic acid whose base sequences allows probe-target base pairing due to complementarity between the probe and target.
So, the correct answer is 'A radioactively labelled single stranded DNA molecule'

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