Who described chromosome structure that appeared in nucleus during cell division?FlemmingStrasburgerWaldeyerSchwann

The structure of chromosomes that appears in the nucleus during cell division was described by Waldeyer.

Waldeyer coined the term "chromosome" in 1888, which refers to the thread-like structures that become visible during cell division (mitosis and meiosis) when chromatin condenses. Prior to Waldeyer, other scientists such as Rudolf Virchow and Heinrich Wilhelm Waldeyer had made significant contributions to the understanding of cell structure and division. However, it was Waldeyer who formally classified and named chromosomes, establishing a foundation for future genetic research.

In summary, while Flemming, Strasburger, and Schwann contributed to cell biology, it was Waldeyer who specifically described the chromosome structure in the context of their appearance in the nucleus during cell division.