Women (and all female mammals) have one active X chromosome per cell instead of two. What causes this?
A) modification of the XIST gene so that it is active only on one X chromosome, which then becomes inactive
B) activation of the Barr gene on one of the two X chromosomes that then inactivates
C) crossover between the XIST gene on one X chromosome and a related gene on an autosome
D) inactivation of the XIST gene on the X chromosome derived from the male parent
E) the removal of methyl (CH3) groups from the X chromosome that will remain active
Examples of sensory receptors in the skin of mammals.
Schematic of typical plant cell
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Forms of Cell signalling
Both men and women gain weight in young adulthood and middle adulthood, losing in the late 50s, but
Gastric Glands and Cell Types in the Stomach