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Vitamin A deficiency - WHO
www.who.intfunction, eye health, vision, growth and survival in human beings (National Research Council 1989). Although animal studies that identi-fied vitamin A as a necessary factor for rat growth were conducted in the early 1900s and the chemical structure of the vitamin was elucidated over 20 years later, reports describing the link between xerophthalmia
EXERCISE 11 – MENDELIAN GENETICS PROBLEMS
www.africangreyparrott.com10.In human beings, a downward pointed frontal hairline ("widow's peak") is a heritable trait. A person with a widow's peak always has at least one parent who also has this trait, whereas persons with a straight frontal hairline may occur in families in which one or even both parents have widow's peak. When both parents have a straight frontal ...