19. What is the formula for biotic potential?

r = PZⁿ(R ^n-1)

This calculates the number of animals produced by a population in year's time.

P = # of females in population
Z = # of young each female produces
n = # of generations per year
R = % of young which are female

For example a female fly lays 120 eggs at a time, she lays 7 times a year and the average percentage of 50% of the hatchings will be female.

A whole lot of flies possible

1 x 120⁷(.5)⁶ = 55,987,200,000,000 flies

Remember that each egg that hatches out results in an individual that in turns will lay 120 eggs, 7 times a year and so on.

Does she have this result, no, because of environmental resistance.