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.
The causes of erectile dysfunction can be as simple as a side effect from a medication, the result of an illness, or from stress and relationship issues. Here, we break down the physical and psychological causes of erectile dysfunction. Common physical causes: 1  certain prescription medications. 2  heart disease. 3  diabetes. 4  high blood pressure. 5  high cholesterol. 6  low testosterone levels. 7  metabolic syndrome.