Question

question 1
when chromosomes duplicate, the copies are.
a not connected together.
b connected together at only one end.
c connected together at both ends but not the middle.
d connected to each other along their entire length.
e connected at only one point.

Explanation:

When chromosomes duplicate, they form sister - chromatids which are identical copies connected at a region called the centromere, meaning they are connected at only one point.

Answer:

E. connected at only one point.