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?

Thus, in her experiments, McClintock observed several fundamental properties of chromosome biology; specifically, she noticed that cells do not tolerate the presence of unprotected chromosome ends ...

In particular, it explains that humans have one fewer chromosome pair in their cells than apes, due to a mutation found in chromosome number 2 that caused two chromosomes to fuse into one.

Each human cell contains 23 pairs of chromosomes that carry DNA within their nucleus. The X and Y chromosomes, commonly referred to as the sex chromosomes, are one such pair.

Human biological sex is determined by the sex chromosomes X and Y. In most cases, females possess two X chromosomes, while males have one X and one Y. However, there is some evidence that the Y ...

The nucleus of each human body cell contains 46 chromosomes. Each chromosome contains about 1000 genes. There is enough DNA in all the cells in a human body to stretch to the sun and back again ...

The Y chromosome, critical for male traits, has been shrinking over millions of years, raising questions about its future and implications for human reproduction. To understand it better ...

Each cell with a nucleus contains chromosomes, which are made from DNA Human body cells each contain 23 pairs of chromosomes, half of which are from each parent. So, human gametes (eggs and sperm ...

Specialized protein machines called SMC complexes (Structural Maintenance of Chromosomes) play a critical role in these ...

Interestingly, this rapid evolution is not unique to humans. Studies of primates show that Y chromosomes across species are highly variable, and some species have even lost their Y chromosome ...

Scientists from the Kavli Institute of Delft University of Technology and the IMP Vienna Biocenter discovered a new property ...