D'autres sources n'utilisent le vocable « chromatide » qu'à partir du moment où les centromères des chromosomes sont en contact l'un avec l'autre. Le nombre de chromatides par type de chromosome dans ...

A chromosome is a single, long molecule of DNA. These highly organized structures store genetic information in living organisms. Small sections of the chromosome, called genes, code for the RNA ...

Les spermatozoïdes sont formés au cours de la spermatogenèse et de la spermiogenèse, dans les tubes séminifères des testicules, par une succession de divisions cellulaires à partir des cellules ...

Klinefelter syndrome is a genetic condition in which a boy is born with an extra X chromosome. Instead of the typical XY chromosomes in men, they have XXY, so this condition is also called XXY ...

Females (XX) carry twice as many X-linked genes on their sex chromosomes as males (XY). How do cells control gene expression to manage this potentially lethal dosage problem? A prime example of X ...

All men and only men have a Y chromosome. This biological fact allows us to trace back in time a direct, largely unchanged genetic line of inheritance from father to son. Every person, male or ...

une information publiée sur le site de Nature. Cette découverte majeure doit permettre de mieux cerner son rôle dans notre organisme. Le chromosome Y sert notamment à déterminer le sexe ...

The genetic information within each of these daughter cells is identical. A human cell contains 46 chromosomes. To simplify our illustration, we'll show only four. Though the genetic code of a ...

Sex determination at birth is decided on the chromosomes the baby has. A female has two X chromosomes, whereas a male has one ...

Increased risk for autism appears to be linked to the Y chromosome, a Geisinger Health System study has found, offering a new explanation for the greater prevalence of autism in males. The results ...