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.
Menopause, is when a woman stops menstruating and can no longer get pregnant, which is a natural event, not a disease or illness. However, for some women the physical and emotional symptoms can be difficult. Perimenopause, when you begin having symptoms but are still having periods, which can last 4 to 5 years. 2  Postmenopause, which occurs once you have gone 12 months without a period. 3  Your ovaries have stopped releasing eggs and produce much less estrogen.