The middle of a chromosome where the two
identical segments from replication are attached
is called the

centromere

Explanation:

During cell division, the identical copies (called a "sister chromatid pair") are joined at the region called the centromere  Once the paired sister chromatids have separated from one another (in the anaphase of mitosis) each is known as a daughter chromosome.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )