Ineed pls 50 ! distinguish between directional, stabilizing, and disruptive selection. give examples.

All three types of selection are trends across generations in which the average frequency of a trait in a population changes. Population ecologists use ALLELE FREQUENCIES (the proportions of VARIABLE alleles at a given gene locus measured in a population) and measure change across generations.

This is easiest visualized using normal graphs - most individuals in the population will be average (or MEAN) and become fewer at the extremes.

For example, here is a graph of human IQ. 100 is the mean. As it goes higher or lower, there are fewer individuals with those IQ's.

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explanation:

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producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls