TLS Online TPP Program

#Id: 9210

#Section 3: Genetics, Cellular and Molecular Biology

Genetic bottleneck

Genetic drift arises is through a genetic bottleneck, which develops when a population undergoes a drastic reduction in size

TLS Online TPP Program

#Id: 9211

#Section 3: Genetics, Cellular and Molecular Biology

THE MAGNITUDE OF GENETIC DRIFT

n  = population size

pq=allelic frequency

sp2=variance in allelic frequency among the populations

TLS Online TPP Program

#Id: 9212

#Section 3: Genetics, Cellular and Molecular Biology

Loss of their original diversity per generation

=1/2n

Gain of their original diversity per generation

=1/2n 

Gain or Loss of their original diversity per generation

=1/4n

TLS Online TPP Program

#Id: 9213

#Section 3: Genetics, Cellular and Molecular Biology

Probability of being heterozygote in given population

H = 1 - 1/2N

TLS Online TPP Program

#Id: 9214

#Section 3: Genetics, Cellular and Molecular Biology

Effective population size(Ne)

Effective number of breeding adults in a population.

TLS Online TPP Program

#Id: 9215

#Section 3: Genetics, Cellular and Molecular Biology

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.