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 affects both males and females, but is not contagious to healthy individuals. Cystic fibrosis is an inherited disease caused by mutations (changes) in a gene on chromosome 7, one of the 23 pairs of chromosomes that children inherit from their parents.Humans have 23 pairs of chromosomes in their DNA. The CF gene is found on chromosome number 7.It takes two copies of a CF gene-one inherited from each parent-for a child to show symptoms of CF. Persons born with only one CF gene (inherited from only one parent) and one normal gene are CF carriers.umans have 23 pairs of chromosomes in their DNA. The CF gene is found on chromosome number 7. It takes two copies of a CF gene-one inherited from each parent-for a child to show symptoms of CF. Persons born with only one CF gene (inherited from only one parent) and one normal gene are CF carriers.