Human chromosomes can be differentiated from one another under a microscope by their lengths and by the position of the centromere.

Scientists were able to identify chromosomes under the microscope as early as the 19th century. But what did it take for them to figure out how important chromosomes really are? Aa Aa Aa The ...

The answer begins in the late 1800s, when insect gonad cells, whose large chromosomes are easy to view through a microscope, were the specimen of choice for investigating the cellular basis of ...