Human X chromosome. Computer illustration of a human X chromosome,on a background of symbols representing the female sex. The X chromosome is one of the two sex chromosomes. The other chromosome is the Y chromosome. Each human cell has 46 chromosomes of which 22 pairs are identical in females and males. The last pair is composed of two X chromosomes for a female,whereas a male has one X and one Y chromosome. In any cell of a normal female one of the X chromosomes is inactivated early in embryonic life and remains inactive ever after. The genes responsible for this inactivation are situated in the lower half of the chromosome | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Nicholls, David |
Taille de l’image : | 4322 px × 6113 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |