a segment of DNA that can move from one place to another in a cell's genome or between a bacterial cell and a plasmid or virus. Viruses may even carry a transposon from one bacterium to another. Also called jumping gene, transposable element. segment of DNA that can move from one place to another in a cell's genome or between a bacterial cell and a plasmid or virus. Viruses may even carry a transposon from one bacterium to another. Also called jumping gene, transposable element.
Women with a low body weight, are frequently under high stress, or in perimenopause tend to have irregular periods. These women have very low estrogen production, so the body has trouble communicating to the ovaries that eggs need to be released, and ovulation does not take place.
During perimenopause, your menstrual flow may become lighter or heavier. You may bleed for longer or shorter periods of time. You may miss periods or bleed more often. Not all changes in menstrual periods are due to perimenopause alone. Sometimes there is a medical cause for the change in menstrual periods, whether the periods become heavier and longer, or lighter and less frequent. Thyroid disease is one common cause of these changes.