Biology (NTSE/Olympiad)  

7. Heredity & Evolution


It is the formation of new species from an existing one due to reproductive isolation of a section of its population.
Development of reproductive isolation is basic to formation of new species. This can occur by the following methods
Physical Barrier :
A physical barrier like valley, mountain, water body, etc. develop between two populations of a species.
Two Ends of Long Range :
Subpopulations at the two ends of a long range seldom interbreed.
Mutations :
A large mutation can make some members reproductively isolated from the rest.
Genetic Drift (Wright Effect) :
It is random change in gene frequency that occurs in a small population due to fixation of certain alleles and elimination of others.

If you want to give information about online courses to other students, then share it with more and more on Facebook, Twitter, Google Plus. The more the shares will be, the more students will benefit. The share buttons are given below for your convenience.

NTSE Biology (Class X)

NTSE Biology (Class IX)


NTSE Physics Course (Class 9 & 10)

NTSE Chemistry Course (Class 9 & 10)

NTSE Geography Course (Class 9 & 10)

NTSE Biology Course (Class 9 & 10)

NTSE Democratic Politics Course (Class 9 & 10)

NTSE Economics Course (Class 9 & 10)

NTSE History Course (Class 9 & 10)

NTSE Mathematics Course (Class 9 & 10)