Report Abuse. In plants that undergo alternation of generations, a gametophyte is the structure, or phase of life, that contains only half of the total complement of chromosomes: The sporophyte produces spores, in a process called meiosis.
The life expectancy of cystic fibrosis patients has been increasing over the past 40 years. In the 1980s life expectancy of people with cystic fibrosis was 14 years. 10 years back, the life expectancy of a person with cystic fibrosis was around 18 years. Today it is 35 years. The median life expectancy of a newborn with cystic fibrosis has increased from 4 years to 32 years. It has been estimated that there has been more than 10 year increase in the average life expectancy of affected people in North America. Over 90% of the affected infants now survive beyond one year.
Cystic fibrosis occurs because of mutations in the gene that makes a protein called CFTR (cystic fibrosis transmembrane regulator). A person with CF produces abnormal CFTR protein-or no CFTR protein at all, which causes the body to make thick, sticky mucus instead of the thin, watery kind.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. person with CF produces abnormal CFTR protein-or no CFTR protein at all, which causes the body to make thick, sticky mucus instead of the thin, watery kind. Cystic Fibrosis affects both males and females, but is not contagious to healthy individuals.