Question

dna mutations
question 4
why are replication and recombination two important roles of dna?
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question 5
what does it mean to say dna replication is semi - conservative?
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question 6
why is one strand of dna built with okazaki fragments and the other is not?

Explanation:

Question 4:

Replication ensures genetic continuity as it duplicates DNA for cell - division and inheritance. Recombination generates genetic diversity by shuffling genetic material, which is crucial for evolution and adaptation.

Question 5:

Semi - conservative replication means that when DNA replicates, each new DNA molecule consists of one original (parental) strand and one newly synthesized strand.

Question 6:

DNA is synthesized in the 5' to 3' direction. The two strands of DNA are anti - parallel. One strand (the leading strand) can be synthesized continuously in the 5' to 3' direction. The other strand (the lagging strand) is synthesized discontinuously as Okazaki fragments because the DNA polymerase can only add nucleotides in the 5' to 3' direction, and it has to work in the opposite direction of the replication fork movement.

Answer:

Question 4:

Replication ensures genetic information is passed on during cell division and inheritance. Recombination creates genetic diversity for evolution and adaptation.

Question 5:

Each new DNA molecule has one parental and one new strand after replication.

Question 6:

DNA synthesis is 5' to 3', strands are anti - parallel. One strand (leading) is continuous, the other (lagging) is discontinuous as Okazaki fragments due to polymerase directionality and replication fork movement.