Question

which of the following models most accurately represents the process of dna replication over two cell divisions? choose 1 answer: a image of dna replication model a b image of dna replication model b c image of dna replication model c d image of dna replication model d

Explanation:

DNA replication is semi - conservative, meaning that each new DNA molecule consists of one original (parental) strand and one newly synthesized (daughter) strand.

• After the first cell division, each of the two resulting DNA molecules should have one old and one new strand.
• After the second cell division, each of the four resulting DNA molecules should also follow the semi - conservative rule.
• In option B, the first round of replication produces two DNA molecules each with one old (blue) and one new (red) strand. The second round of replication then produces four DNA molecules, each of which still has one old and one new strand (a mix of blue and red in a way consistent with semi - conservative replication).
• Option A shows non - semi - conservative patterns in the second round. Option C shows conservative replication (where one molecule is all old and one is all new after first division, which is incorrect). Option D also has incorrect strand combinations in the second round of replication.

Answer:

B. The model in option B