Eukaryote chromosomes sometimes consist of a single chromatid. At the start of meiosis, each chromosome consists of 4 joined chromatids. An adult human is a diploid organism. The structure of the DNA backbone includes negatively-charged phosphate groups. It makes sense, then, that histone proteins carry a positive charge.
Chromosome number is reduced.
Meiosis and cytokinesis occur. Mitosis and cytokinesis occur. Crossing over occurs. During meiosis, homologous chromosomes exchange DNA sequences. At the start of meiosis, each chromosome consists of two chromatids.