How Stem Cells Produce Different Kinds of Cells
That single cell contains all the genetic information needed to develop into a human, and passes identical copies of that information to each new cell as it divides into the many ... "We do not know yet why copies of X and Y chromosomes segregate ...
Introduction to genetics, part 2
We speak of meiosis in terms of two successive stages: Meiosis I - The chromosomes of a cell are replicated. They produce duplicated sister chromatids ... They therefore do not resemble the chromatids of either the father or mother, but are distinct ...
Divide and define: Clues to understanding how stem cells produce different kinds of cells
The apical tip of fruitfly testis containing germline stem cells and differentiating germ cells. Copies of Y chromosome ... many diverse types of cells that make up a complex organism like a human being. If each cell is genetically identical, however, how ...
Seeing X Chromosomes in a New Light
Maybe he saw it as an extra chromosome. Or perhaps he thought it was an ex-chromosome. Maybe he used X the way mathematicians do, to refer to ... dramatic. Two cells side by side may be using different versions of many different genes.
Basics: How can chromosome numbers change?
Which leads me to believe that if the number does ... chromosome form. What if two individuals carrying the two chromosome variant breed? They can produce offspring that look like this: How many centromeres are there? Four, not three. This is a situation ...