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Wilhelm Roux suggested that each chromosome carries a different genetic load.
The nucleoid is a distinct structure and occupies a defined region of the bacterial cell.(2) Centromere – the point where the two chromatids touch. Chromosomes are normally visible under a light microscope only when the cell is undergoing the metaphase of cell division.Before this happens, every chromosome is copied once (S phase), and the copy is joined to the original by a centromere, resulting in an X-shaped structure.Aided by the rediscovery at the start of the 1900s of Gregor Mendel's earlier work, Boveri was able to point out the connection between the rules of inheritance and the behaviour of the chromosomes.Boveri influenced two generations of American cytologists: Edmund Beecher Wilson, Nettie Stevens, Walter Sutton and Theophilus Painter were all influenced by Boveri (Wilson, Stevens, and Painter actually worked with him).
This allows the very long DNA molecules to fit into the cell nucleus.