Questions and Answers

With the help of suitable examples, discuss the applications and limitations of allopolyploidy in crop improvement.

Briefly discuss the evolution of the following crops: (i) Brassica spp., (ii) Triticum aestivum, (iii) Nicotiana tabacum, and (iv) Gossypium hirsutum.

What is ailopolyploidy? Discuss the origin ni nature and experimental production of allopolypioids.

Define autopolyploidy. briefly describe the methods of production of autodolyploids and their importance and limitations in crop improve- ment.

What are the common aneuploid analyses for locating genes on a particular chromosome? Give abrief description of these techniques using suitable diagrams where necessary.

Discuss the physiological bases of heterosis.

Write short notes on the following: (i) sickle cell anaemia, (ii) pab locus in Neurospora, (ili) ma gene in maize, (iv) Adh alleles in maize, (v) inbreeding depression, and (vi) hybrid vigour.