Is a recessive, hereditary disease that is life threatening because of overproduction of mucus in vital organs such as the lungs.

Cystic fibrosis is a recessive, hereditary disease that is life threatening because of overproduction of mucus in vital organs such as the lungs.

Explanation:

Cystic fibrosis is a recessively inherited dis.ease in which the amount of mucus secreted at various places in the body is abnormally high. The most important places where the mucus is formed are the lungs, the gastrointestinal tract, the liver and the pancreas. Patients have a significantly lower life expectancy than normal due to respiratory infections.

The reduced production of pancreatic enzymes causes a delayed growth, a fatty diarrhea and a shortage of fat-soluble vitamins. Infertility may occur in boys. In newborns there is often a metabolic disorder, referred to as meconium ileus.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".