Two distinct populations of neoblasts exist:

1. Sigma neoblast population 

2. Zeta neoblast population 

TLS Online TPP Program

#Id: 9213

#Unit 11. Evolution and Behavior

Probability of being heterozygote in given population

H = 1 - 1/2N

TLS Online TPP Program

#Id: 9214

#Unit 11. Evolution and Behavior

Effective population size(Ne)

Effective number of breeding adults in a population.

TLS Online TPP Program

#Id: 9215

#Unit 11. Evolution and Behavior

Some factor determine Ne

1.Sex ratio.

2.Variation between individual in reproduction success.

3.Fluctuation in population size.

4.The age structure of the population.

5.Mating is random.

TLS Online TPP Program

#Id: 9216

#Unit 11. Evolution and Behavior

Ne = Male + Female  (when both are equal)

Ne = 4 × n(male) × n(female)/n(male)+n(female) 

(When both unequal Ne is smaller than then sum of both)

TLS Online TPP Program

#Id: 4685

#Unit 11. Evolution and Behavior

Social behaviour includes all kind of interaction between individuals of the same species.

TLS Online TPP Program

#Id: 4686

#Unit 11. Evolution and Behavior

Interactions are classified by how they affect the fitnesses of the two individuals.