1 roentgen unit is a quantity of X ray that produces 2.083X109 ion pairs in one cubic centimeter of air at 0C and a pressure of 760 mm of mercury.

TLS Online TPP Program

#Id: 9172

#Unit 11. Evolution and Behavior

Migration

Change in the allelic frequencies is the influx of genes from other populations, commonly called migration or gene flow

TLS Online TPP Program

#Id: 9173

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 9174

#Unit 11. Evolution and Behavior

The overall effect of migration is twofold: 

1.it prevents populations from becoming genetically different from one another, 

2.it increases genetic variation within populations.

TLS Online TPP Program

#Id: 9175

#Unit 11. Evolution and Behavior

Amount of change in allelic frequency due to migration

m= proportional of migratory individual in  recipient population

qI – frequency of allele in source population  

qII – frequency of allele in recipient population

TLS Online TPP Program

#Id: 9176

#Unit 11. Evolution and Behavior

Adaptation is a characteristic that enhances the survival or reproduction of organisms .

Adaptations have evolved by natural selection, which is the centerpiece of On the Origin of Species

TLS Online TPP Program

#Id: 9177

#Unit 11. Evolution and Behavior

Adaptation has costly side effects