At different times during the life cycle of a cell, the DNA that makes up the cell's chromosomes can be tightly compacted into a structure that is visible under a microscope, or it can be more ...

A gene is a small section of DNA in a chromosome ... passed on to the next generation. The diagram shows the relationship between the cell, its nucleus, chromosomes in the nucleus, and genes.

Chances are you've seen an illustration of DNA's double-helix structure and even pictures of the chromosomes that ... to 15 different levels to see DNA's relationship to us as a whole.

The chromosomes of sperm cells are tightly packaged into a complex of DNA and protamines. Converting the chromatin from a nucleohistone to a nucleoprotamine structure may serve both biophysical ...