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.
1 Perimenopause lasts up until menopause, the point when the ovaries stop releasing eggs. 2  In the last 1 to 2 years of perimenopause, the drop in estrogen quickens. 3  At this stage, many women have menopause symptoms. 4  Menopause. 5  This is the point when it's been a year since a woman last had her last menstrual period.