The author who recently wrote that when it comes to chromosomes, it is XX or XY, is mistaken. It could be, in rare cases, XXY. Have something on your mind? Send to letters@adn.com or click here to ...

Cytologists had been studying chromosome behavior since the late 19th century. Why did it take until 1956 to figure out the correct human chromosome number, thanks to Joe Hin Tjio and Albert Levan? Aa ...

The chromosomes tell the truth. XX or XY. If you completed high school and paid attention, XX or XY. If you know the difference, thank a teacher. You can cut off or glue, weld, stitch, strap or cover ...