Chemical mutagens can be divided into two groups:

those that are mutagenic to both replicating and nonreplicating DNA, such as the alkylating agents and nitrous acid; and 

those that are mutagenic only to replicating DNA, such as base analogs— purines and pyrimidines with structures similar to the normal bases in DNA.

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#Unit 10. Ecological Principles

The prey zero isocline 

A specific number of predators will keep the prey population at zero growth.

P=r/s

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#Id: 9117

#Unit 10. Ecological Principles

The number of predators, P, increase when prey numbers are high and decrease when prey numbers, N

TLS Online TPP Program

#Id: 9118

#Unit 10. Ecological Principles

The predator zero isocline

A specific number of prey will keep the predator population at zero growth.

N=m/es

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#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 9120

#Unit 10. Ecological Principles

I-Predator carrying capacity: Predator can no longer drive prey to extinction. Stable coexistence

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#Id: 9121

#Unit 10. Ecological Principles

II- if a predator has multiple prey

If prey abundances are not strongly positively correlated then as one prey species becomes scarce, the predator can continue to feed and increase its population size