What are the differences (comparisons) between single-structured and double-structured chromosomes?

Chromosomes: single-structured vs double-structured 

The differences (comparisons) between single-structured and double-structured chromosomes are as follows: 

Differences & comparisons between single-structured and double-structured chromosomes
Single Structured chromosome	Double structured chromosome
Un-duplicated chromosome	Duplicated chromosome
Single centromere	Single centromere
Contain non-replicated DNA	Contain replicated DNA
One chromosome with one chromatid	One chromosome with two chromatids
2n chromosome in a diploid cell	2n chromosome in a diploid cell
2N DNA in a diploid cell	4N DNA in a diploid cell

 

Additional:

Gametogenesis, Meiosis, Homologous chromosome,  allele of the gene

Chromosomes: 1n and 2n chromosomes

DNA: 2N and 4N