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.
There are many underlying physical and psychological causes of erectile dysfunction. Reduced blood flow to the penis and nerve damage are the most common physical ED causes. Underlying conditions associated with erectile dysfunction include the following: Vascular disease.