True or false: “The change from a T to a C at position 3 caused all of the changes that exist between
the cichlid and coelacanth/frog.” Explain your answer.

The above statement is false.

Explanation:

When a single nucleotide is changed at a particular position of the nucleotide sequence, then this change will result in the formation of a faulty protein.

This is because that particular position of the genetic sequence is associated with the formation of a particular protein. All the other proteins formed will be normal.

Hence, we cannot attribute all existing changes between the cichlid and coelacanth/frog on this single nucleotide change.

However, if instead of replacement of a T with a C, an addition or deletion had been made, then the entire genetic code would have been altered. This would have resulted in more number of faulty proteins being formed.

what subject is this

yes? sounds right, but you didn’t ask a question.