principle #1 Genetic Variation In the population of the cobalt blue tarantula, there are some males that contain a disease that they caught with fungi. But other male cobalt blue tarantula do not have this disease, The female tarantula is smaller than the male but also the disease can affect their offspring or their mate
Principle #2 Over population & Selective Pressures So if the male does not have the disease and mate with the female their offspring will have the disease, but if the male does have the disease and mate with the female the offspring won't have the disease so in that case the female will die.
Principle#3 Different survival & reproduction The Male spiders that got the mutation from a parent from the bacteria some will survive because if they eat they get to reproduce with they survive if they don't have enough to eat then they die. the figure above show what happens if the spiders don't eat.
Principle#4 changes in the gene pool Every generation they have the spiders blue cobalt tarantulas population will get small because they have a mutation that is strong but if they eat they will have a good amount of population during their generation but there will be more males than female if the males have the mutation if they don't then they die.