K and r<span> Reproductive </span>Strategies<span>. In the equations describing growth of populations of organisms, </span>r represents the slope of the line representing exponential growth. The letter K represents the carrying capacity of a habitat for members of a given sort of organism. <span>The population is still at low values relative to the carrying capacity of the environment and thus is growing exponentially with intrinsic reproductive rate </span>r<span> (when it is not subject to environmental perturbations.), hence the name </span>r-strategist.As the name implies, r-selected species are those that place an emphasis on a high growth rate, and, typically exploit less-crowded ecological niches, and produce many offspring, each of which has a relatively low probability of surviving to adulthood (i.e., high r<span>, low K).</span>
if B and b are the two alleles , B + b = 1 and B ^2 +2 Bb + b ^2 = 1. If 16% of mice are homozygous black , B ^ 2 =0 .16, meaning B = 0 .4 and b = 1 - 0.
