The final step in the hybridization of radioactive dna and normal dna is to:

a. heat a mixture of the two types of dna.

b. cool a hot mixture of the two types of dna.

c. expose two types of dna to radiation.

d. make a solution with the two types of dna.

B

Explanation:

Cooling reduces the excitement of the molecules of the DNA hence allowing the hydrogen bonds between the base pairs of the two strands to form hence the DNA is considered to anneal. Heating disrupts the hydrogen bonds and causes the two strands to dissociate.

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