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.
The Genetics of Cystic Fibrosis. Cystic fibrosis (CF) is a genetic disease. This means that CF is inherited. A child will be born with CF only if two CF genes are inherited--one from the mother and one from the father.A person who has only one CF gene is healthy and said to be a carrier of the disease.A carrier has an increased chance of having a child with CF.ccording to the Cystic Fibrosis Foundation, the risk for having a mutation in the gene for CF depends on your ethnic background if you have no family history of CF: Ethnic Background. Risk of CF Mutation. Risk of Child with CF.