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 cell's nucleus contains chromosomes. These are long threads of DNA, which are made up of many genes. Humans have around 25,000 genes across their 23 pairs of chromosomes.

Females have one active X chromosome and one dormant X chromosome in each cell. But a study suggests that genes on the ...

Excessive X-gene expression is presumed to have decreased female fitness until the X-inactivation system evolved to silence the doubly-dosed genes on one of the X chromosomes in females.

How do sex chromosomes affect intelligence? Created with Sketch. The X chromosome carries at least 150 genes linked to intelligence. Since the mother has two X chromosomes to pass along while the ...

Women have a higher proportion of key immune cells between puberty and menopause, which may be linked to the sex hormone estrogen and explain why they are less susceptible to certain infectious ...

In humans and other mammals, females have two X chromosomes while males have one X and a Y. What makes the Y chromosome so ...

Alternatively, packing of sperm chromatin may serve to reprogram the paternal genome so that the appropriate genes from the father's chromosomes are expressed in the early embryo. Whereas most ...

The New Science of Nature and Nurture.” Since Francis Galton coined the phrase “nature versus nurture” 150 years ago, the debate about what makes us who we are has dominated the human sciences. Do ...

However, the genetic fragments tended to connect in unpredictable sequences of varying lengths, making it difficult to anticipate how the genes would behave. Furthermore, the constructs often attached ...

Transposons, or "jumping genes"—DNA segments that can move from one part of the genome to another—are key to bacterial evolution and the development of antibiotic resistance. Cornell ...