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.
Most of the symptoms associated with menopause actually happen during the perimenopause stage. Some women go through menopause without any complications or unpleasant symptoms. But others find menopausal symptoms debilitating, beginning even during perimenopause and lasting for years. The symptoms that women experience are primarily related to a lowered production of the female sex hormones estrogen and progesterone.