The overall change in allelic frequency is a balance between the opposing forces of forward mutation and reverse  mutation:

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#Id: 3692

#Unit 2. Cellular Organization

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#Id: 9258

#Unit 6. System Physiology – Plant

Photosynthetic photon flux density (PPFD)—the flux of light (usually expressed as micromoles per square meter per second [μmol m–2 s–1]) within the photosynthetically active range (400–700 nm).

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#Id: 5379

#Unit 10. Ecological Principles

Uniform: Competition may cause a uniform dispersion pattern between individuals. The pattern of trees and seedlings may appear random as seedlings develop from seeds dropped at random.

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#Id: 8000

#Unit 10. Ecological Principles

No two different species can share the same niche but can have similar niches,  this is because of competition for resources like food, space etc

Two species cannot coexist permanently in a community if their niches are  identical

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#Id: 5475

#Unit 7. System Physiology – Animal

Postsynaptic inhibition occurs when an inhibitory transmitter (eg, glycine, GABA) is released from a presynaptic nerve terminal onto the postsynaptic neuron.