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.
There is no way to accurately predict how long people with cystic fibrosis will live, as many different factors may affect a personâs health. Severity of disease and time of diagnosis are two such factors.sing data from the CF Foundation Patient Registry, which is gathered from patients treated at CF Foundation-accredited care centers, we do know that more than 40 percent of all people with CF in this country are 18 years or older. In addition, we have calculated the predicted median age of survival.