Natural Selection Trends
Long tails in lizards is more beneficial over very short tails, is an example of this type of selection.
What is directional selection?
A leatherback sea turtle can lay up to 120 eggs a season, is an example of this principle.
What is overproduction?
A regulation of an internal environment with an ever changing external environment.
What is homeostasis?
This species is responsible for keeping other species "in-check".
What is a keystone species?
Laying 4 eggs is more beneficial than laying 3 or 5 eggs, is an example of this type of selection.
What is stabilizing selection?
More stripped patterns are found in a population over other patterns because it allows for better camoflauge, is an example of this principle.
What is descent with modification?
This feeback loop causes a system to change further in the same direction.
What is a negative feedback loop?
A snake eats mice, which leads to an increase in bugs in an ecosystem. This is an example of this effect.
- Direct effect
- Indirect effect
What is an indirect effect?
Having white fur or black fur is more beneficial than just having gray fur, is an example of this type of selection.
What is disruptive selection?
A bird is born with a bigger/stronger beak that allows it to eat larger seeds, is an example of this principle.
What is an adaptation?
This feeback loop causes a system to change in the opposite direction from which it is moving.
What is a positive feedback loop?
In a marine population, rays eat clams, oysters, snails, shrimp, crabs, and small fish, while sharks eat the rays. This species would be the keystone species.
What are sharks?
Peacocks with with very short feathers don't get mates, but peacocks with excessively long feathers also don't get mates, is an example of this type of selection.
What is stabilizing selection?
A population of beetles have multiple different shades of greens, and come in multiple different sizes is an example of this principle.
What is variation?
A rabbit population eats all the grass in a meadow. This is an example of this type of effect.
- Indirect
- Direct
What is a direct effect?
A volcano erupts and covers the ground in gray ash. Moths with gray wings end up surviving more than moths with brown wings.
What is directional selection?
Without the keystone species this would happen to an ecosystem's biodiversity.
What is decrease?