happen when pairs of bonded bases in a double strand of DNA get replaced with different pairs. happen when extra base pairs are included in an existing DNA sequence.

happen when base pairs in an existing DNA molecule get removed from it.

Fill in the blanks correctly

Explanation:

A base pair is two chemical bases bonded to one another forming a "rung of the DNA ladder." The DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases--adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.

ok

explanation:

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher