How new species are created is at the core of the theory of evolution. Mammals may be a good example of how sex chromosome change drove major groups apart.
What produces the differences between men and women? Are they trivial or profound? Are they genetic or environmental, or both? And are men really closer genetically to chimpanzees than to women?
Aneuploidy – when a cell has an irregular number of chromosomes – is a major cause of pregnancy loss. Scientists may have uncovered a gene that increases the risk of aneuploidy.
Degeneration of plant Y chromosomes can help us understand why our own have shrunk, according to recent research. Researchers…