Growing degree-day. Growing degree days (GDD), also called growing degree units (GDUs), are a heuristic tool in phenology. GDD are a measure of heat accumulation used by horticulturists, gardeners, and farmers to predict plant and animal development rates such as the date that a flower will bloom, an insect will emerge from dormancy, or a crop will reach maturity.
Cystic fibrosis is a genetic condition caused by a faulty gene (known as the CFTR gene). The CFTR gene normally creates a protein that moves salt and water out of a cell.If the CFTR gene is defective, it results in a build-up of thick, sticky mucus in the body's tubes and passageways.ystic fibrosis is a genetic condition caused by a faulty gene (known as the CFTR gene). The CFTR gene normally creates a protein that moves salt and water out of a cell.
Cystic fibrosis is caused by a mutation on the CFTR gene (cystic fibrosis transmembrane conductance regulator gene) on chromosome 7 (7q31.2). The CFTR gene is located on the long arm in the q31.2 region of chromosome 7.CFTR is an autosomal recessive gene.This means that you must inherit two defective genes, one from each parent, to have cystic fibrosis. A carrier of cystic fibrosis has one CFTR defective gene.he CFTR gene is located on the long arm in the q31.2 region of chromosome 7. CFTR is an autosomal recessive gene. This means that you must inherit two defective genes, one from each parent, to have cystic fibrosis.