Question

o There are a number of traits in humans that affect development, function or over-all health of the body, and show a classic Mendelian inheritance pattern.

o Search the internet to find an example of such a Mendelian trait and write a paragraph that includes:

▪ Whether the trait is dominant or recessive

▪ How common or rare the trait seems to be

▪ What symptoms are caused by the trait and how it affects the overall function and health of the human body.

▪ What treatment(s), if any, are available to individuals who possess the trait.

Answer 1

Cystic fibrosis (CF) is a mendelian trait that affects mostly the lungs, but also the pancreas, liver, kidneys, and intestine. CF is inherited in an autosomal recessive manner. It is caused by the presence of mutations in both copies of the gene for the cystic fibrosis transmembrane conductance regulator (CFTR) protein.Those with a single working copy are carriers and otherwise mostly healthy.CFTR is involved in the production of sweat, digestive fluids, and mucus. When the CFTR is not functional, secretions which are usually thin instead become thick. symptoms of cystic fibrosis are salty-tasting skin, poor growth, and poor weight gain despite normal food intake, accumulation of thick, sticky mucus, frequent chest infections, and coughing or shortness of breath. CF is most common in Northern European ancestry and affects about 1 out of every 3,000 newborns. About 1 in 25 people is a carrier. It is least common in Africans and Asians. Till now, there is no known cure for cystic fibrosis.

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