Chromosomes are tightly coiled structures in each of your cells that contain DNA, the code for all life. DNA is organized in segments on chromosomes called genes. Humans typically have 46 chromosomes ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. An X-linked gene called ...

In female mammals, one of the two X chromosomes is usually inactive and forms the so-called Barr body. The image shows a cell nucleus with the Barr body marked in green. Unlike men, who carry one X ...

A microscopic image of neurons expressing the mother’s X chromosomes in green, and the father’s X chromosomes in red. Credit: Arturo Moreno. Women are born with two X chromosomes and inherit one from ...

Microscope image of subdermal muscle from a skin of a 52,000-year-old mammoth showing remnants of mammoth nuclei. “We’ve known that tiny fragments of ancient DNA can survive for long periods of time,” ...

The 23 rd chromosome base pair contains what are known as our sex chromosomes. For most females, this pair contains two X chromosomes, while for most males, it contains one X chromosome and one Y ...

Robertsonian chromosomes are large chromosomes that form when the long arm of a chromosome breaks and fuses with another chromosome. They are the most common type of chromosome rearrangement in humans ...

Sex is determined in a variety of different ways throughout the animal kingdom. In mammals, it is determined genetically, not by temperature, as it can be in reptiles. Typically, females have two X ...

A study shows that extra chromosomes in fetal cells create pre-leukemic clones that can persist for years, requiring later triggers to develop into leukemia, revealing a two-stage disease model.

B-cell acute lymphoblastic leukemia is the most common form of childhood cancer. In this type of cancer, which affects blood ...