When bacterial DNA is labeled with radioactive atoms, it takes its own picture. Autoradiographs reveal that the bacterial chromosome is a single very long DNA molecule and show how it is duplicated ...

In particular, it explains that humans have one fewer chromosome pair in their cells than apes, due to a mutation found in chromosome number 2 that caused two chromosomes to fuse into one.

All men and only men have a Y chromosome. This biological fact allows us to trace back in time a direct, largely unchanged genetic line of inheritance from father to son. Every person, male or ...

The appropriate volume of each labeled pool (to contain 100 ng of ... channel was viewed individually and the signal for each chromosome recorded manually. This was important to resolve any ...

Fluorescently labeled cells can also be sorted into separate ... In addition, this approach can also be used to determine changes in chromosome size and number. Larger chromosomes contain a ...