When stained, chromosomes show bands of light and dark ... The DNA molecule is made up of four bases -- adenine (A), cytosine (C), guanine (G), and thymine (T). Each rung of the DNA ladder ...

Organisms are made up of cells. Most organisms are multicellular ... Cell division - AQA Chromosomes carry genetic information in a molecule called DNA. A type of cell division called mitosis ...

Each replicated chromosome is made up of two identical strands called ... with a diploid chromosome number of four (two sets of two chromosomes) undergoing cell division. The replicated ...

But how did researchers discover these so-called sex chromosomes? Throughout the many observations that led to this conclusion, Sutton made careful note of the path of the accessory chromosome.

Now, they have successfully assembled a detailed reconstruction of the extinct species' chromosomes – thread-like structures that are made up of DNA. This is the first time scientists have been ...

Nettie Maria Stevens grew up in America just after the Civil ... made reproductive cells with both X and Y chromosomes whereas the females made only those with X. She concluded that sex is ...