She's Having a Baby She's Having a Baby She's Having a Baby is a 1988 American romantic comedy film directed and written by John Hughes. The film portrays a young newlywed couple, Kristy and Jake Briggs played by Elizabeth McGovern and Kevin Bacon, who try to cope with married life and their parents' expectations. This film looks at the lives of Jefferson "Jake" (Kevin Bacon) and Kristy Briggs (Elizabeth McGovern), from their wedding day until the birth of their first child, mostly through Jake's eyes, with his voiceover commentaries and several imaginary scenes. Jake asks his best friend, Davis McDonald (Alec Baldwin) before the
Small population size precisely three individuals in the effective population), one will become extinct within one generation just because they are all the same sex. If the population remains at this size for several generations, such an event becomes almost inevitable. The environment can directly affect the survival of a small population. Some detrimental effects include stochastic variation in the environment, (year to year variation in rainfall, temperature) which can produce temporally correlated birth and death rates (i.e. 'good' years when birth rates are high and death rates are low and 'bad' years when birth rates are low and death rates are high)