Question

Dna stability and reason causes variation

Answer 1

dna is more stable than rna

1)dna lacks -OH group on second carbon of ribose which makes it more stable

2)dna has thymine in place  of uracil which makes dna more stable than rna

3)rna is highly reactive becoz it has catalytic function

4) dna is double stranded so it is more stable

causes of variation in dna-

1 )mutations

2)recombination during meiosis

3)Sexual reproduction promotes variable gene combinations