Cytologists had been studying chromosome behavior since the late 19th century. Why did it take until 1956 to figure out the correct human chromosome number, thanks to Joe Hin Tjio and Albert Levan?

However, other karyotypes can include, but are not limited to, 48 chromosomes (XXXY) and 49 chromosomes (XXXXY). 2 This disease affects males, with the incidence being reported as being between 1 ...

A chromosome is a single, long molecule of DNA. These highly organized structures store genetic information in living organisms. Small sections of the chromosome, called genes, code for the RNA ...