There is great deal of potentially confusing terminology associated with chromosomes and their number. For example, duplicated chromosomes are called 'sister chromatids' as long as they are attached, but as soon as they separate, they become 'daughter chromosomes.' And a pair of copied or replicated chromosomes are not the same as a pair of homologous chromosomes. The following articles will help you brush up on DNA lingo and detangle these and other genetic technical terms.
Articles on Chromosomes & Their Number
Ploidy - Diplod and Haploid: Chromosome Number of Somatic and Sex Cells
DNA - Duplicated and Homologues: Difference between Homologous and Replicated Chromosomes
Chromosomes & Sister Chromatids: Terms Used to Describe DNA during Cell Division