Question

Can quality be characteristic feature for which local breeds of cattle are selected for hybridisation

Answer 1

Most probably not. In local breeds, what people look for is the immunity to diseases. In exotic breeds people look for quality of milk.

Local breeds- Gir, Sahiwal
Exotic breeds - Holstein- Friesian, Jersey Swiss

Answer 2

Answer:

Salient features of hybridisation :

(1) Atomic orbitals of the same atom can take part in hybridisation

(2) Only atomic orbitals and not electrons undergo hybridisation

(3) The atomic orbitals of comparable energies only can undergo hybridisation.

(4) The number of hybrid orbitals formed is equal to the number of hybridising orbitals.

(5) The shape of the hybrid orbitals is different as compared to the shape of hybridising atomic orbitals.

(6) All the hybrid orbitals are equivalent and have the same shape and energy.

(7) Hybrid orbitals orient in space, so as to minimise repulsion between their electrons and have maximum symmetry. Geometry of the molecule is due to the orientation of hybrid orbitals.

(8) The covalent bonds formed by hybrid orbitals is stronger than those by pure atomic orbitals.