It's not accurate to say that a chromosome has just *one* member. Chromosomes are made up of two *sister chromatids* that are joined together at a point called the centromere.

Here's how to think about it:

* Chromosomes: These are long, thread-like structures that hold our genetic information (DNA).

* Sister Chromatids: These are identical copies of a chromosome, joined together. They are created during DNA replication in preparation for cell division.

What do sister chromatids do?

* Carry Genetic Information: Each chromatid contains a complete set of genetic instructions for the organism.

* Separate During Cell Division: During cell division (mitosis or meiosis), the sister chromatids separate, ensuring that each new cell receives a complete set of chromosomes.

So, in short, it's the *two sister chromatids* that make up a chromosome and play crucial roles in carrying and distributing genetic information.