The word allele is a short form of allelomorph (other form, a word coined by William Bateson and Edith Rebecca Saunders), which was used in the early days of genetics to describe variant forms of a gene detected as different phenotypes.
Causes. Male sexual arousal is a complex process that involves the brain, hormones, emotions, nerves, muscles and blood vessels. Erectile dysfunction can result from a problem with any of these. Likewise, stress and mental health concerns can cause or worsen erectile dysfunction.Sometimes a combination of physical and psychological issues causes erectile dysfunction.For instance, a minor physical condition that slows your sexual response might cause anxiety about maintaining an erection.rectile dysfunction can result from a problem with any of these. Likewise, stress and mental health concerns can cause or worsen erectile dysfunction. Sometimes a combination of physical and psychological issues causes erectile dysfunction.
Causes of Erectile Dysfunction. Erectile dysfunction (ED) occurs when a man is unable to get or sustain an erection firm enough for sexual intercourse. Intermittent ED is common. Many men experience occasional ED. It is generally caused by stress, exhaustion, or similar causes. Occasional ED should not be a cause of concern. However, men who experience frequent ED should talk to their doctors. Frequent ED may be a sign of damage to the cardiovascular or nervous systems. This damage may need treatment.