As a result, most of the Y today is made up of repetitive "junk DNA." With such an unstable composition, the Y chromosome is ...

Thus, in her experiments, McClintock observed several fundamental properties of chromosome biology ... the first information about its molecular composition. We now appreciate that this unusual ...

Much of what is known about the composition of these structures is ... Because centromeres vary in length, an individual chromosome can contain anywhere from hundreds to thousands of potential ...

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.

However, there is some evidence that the Y chromosome is being phased out of the evolutionary pipeline, and could one day disappear altogether — potentially giving rise to a new sex gene in the ...

Using both the new echidna genome sequence and an existing platypus genome sequence, the international team of researchers reconstructed the likely chromosome composition of the monotreme ancestor.

The reason female brains have less cognitive aging may be due to the reawakening of the dormant X chromosome late in life, which turns on genes that help sustain healthy brain cell connections.