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.
Life expectancy is likely to be different for people of different ages; and this is before taking into account the fact that cf can also affect people differently. The median predicted survival for someone with cystic fibrosis currently stands at 41 years old. This means that according to the statistics on our clinical CF Registry, currently half of those with cystic fibrosis will live to over 41 years old, although a baby born today can be expected to live longer.