Prokaryotes have one chromosome consisting of a circular DNA molecule.
Some prokaryotes also have plasmids but eukaryotes do not.
Eukaryote chromosomes are linear DNA molecules associated with histone proteins.
In a eukaryote species there are different chromosomes that carry different genes.
Homologous chromosomes carry the same sequence of genes but not necessarily the same alleles of those genes.
Diploid nuclei have pairs of homologous chromosomes.
Haploid nuclei have one chromosome of each pair.
The number of chromosomes is a characteristic feature of members of a species.
A karyogram shows the chromosomes of an organism in homologous pairs of decreasing length.
Sex is determined by sex chromosomes and autosomes are chromosomes that do not determine sex.