Question

which event during dna replication is a major source of new, inheritable genetic variations? (1 point) the separation of the two dna strands. an error occurring when the dna is copied. the correct pairing of nucleotide bases. the formation of the sugar-phosphate backbone.

Explanation:

To determine the major source of new, inheritable genetic variations during DNA replication:

• The separation of DNA strands (first option) is a normal step in replication, not a source of variation.
• Errors during DNA copying (mutations) can change the DNA sequence, introducing new genetic variations that can be inherited.
• Correct nucleotide pairing (third option) maintains the original sequence, not creating variation.
• Formation of the sugar - phosphate backbone (fourth option) is a structural step, not a source of genetic variation.

Answer:

B. An error occurring when the DNA is copied.