### inherited trait:

Hair loss
* Most hair loss is caused by pattern baldness
  - hereditary
* affects both men and women
  - one out of three men and one in five women
  - only intellectuals
  - two out of every three men, and one in five women
* begins after childbirth
  - in the lateral frontal areas or over the vertex
  - when many of the hairs stop being replaced naturally
* can affect the eyelashes, eyebrows, and hair on the head, arms, legs, and groin area.
* can also be a sign of a serious illness such as thyroid disease, anemia or diabetes
  - stress-related, or tied to an emotional problem
  - occur on other areas of their bodies
  - progress over the body
* can be a symptom of skin disease or parasites, and also warrants a trip to the vet
  - devastating for the millions of men and women who experience it
  - responsible for depression, feelings of inadequacy, and low self-esteem
* can cause a wide range of emotions from anger to grief
  - strong psychological drawbacks for males
  - happen at any time of life for any number of reasons
* can occur as thinning hair or complete baldness
  - at the site of the body where radiation is received
  - for many reasons, including genetics, vitamin deficiency, or underlying illness
* can occur in scarred areas of the scalp
  - women for reasons other than female-pattern baldness
  - upon chronic exposure
  - result from many factors
* caused by chemotherapy and radiation therapy is temporary
* common and distressing symptom, affecting men and women of all ages
  - complaint of many patients, both men and women
  - concern for both men and women
* common problem for both men and women
  - that many people experience
  - side affect of chemotherapy or radiation treatment
* has many causes.
* is an inherited trait
  - unfortunate, common occurance for many men and women
  - associated with poor nutrition
* is caused by an enzyme that shrinks hair follicles and causes the hair to fall out
  - iron overload
  - certain with some Chemo drugs
* is common - nearly two out of every three men develop some form of balding
  - with many anticancer drugs and usually begins two weeks after treatment
  - common, and often occurs in a symmetric pattern over the animal's trunk
  - genetically programmed, it consequence of evolutionary pressures, it is normal
  - gradual, with miniaturization of genetically programmed hair follicles
  - listed as a side effect of serotonin reuptake inhibitors
  - medical conditions
  - minimal and related to the amount of drug given
  - nearly complete over most of the body
  - observed along the shoulders, flanks, sides, and paws
  - obviously much more common in males than in women
* is one of the most distressing side effects of chemotherapy
  - sign of malnutrition
  - quite variable for children being treated for leukemia
* is rare with dactinomycin
  - filgrastim
  - lomustine
  - mechlorethamine
  - methotrexate
  - mitomycin
  - pentostatin
  - plicamycin
  - procarbazine
  - referred to as alopecia
  - the most dreaded side effect in cancer chemotherapy treatment
  - thus one of the major symptoms of anorexia and bulimia
* natural part of the body's process of renewal.
* occurs because radiation affects cells that are dividing, which includes hair follicles
  - in other primates and is linked to social status and rank within the group
* occurs in some people, but usually minor and reversible
  - the fall and then regrows
* occurs, especially in the male with typical 'male pattern baldness'.
* problem that affects millions of people, including men, women, and even children.
* side effect of SOME chemotherapy agents and is only temporary.
* trait inherited through the maternal side of the family.
* very negative factor in cancer patient care and quality of life.

Male sterility
* is inherited.
* occurs in plants where pollen or anthers fail to function properly.