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.
Explain the dominance and overdominance hypotheses of heterosis giving their muin features, objections and answers to the objections. Which of the above two hypotheses is more widely accepted and why ?
Diffetentiate between the following ; (i) homozygous and homogeneous lines, (it) homozygous and heterozygous balance, (iji) genetic coad and gene pool, (iv) heterosis and luxuriance, (v) heterosis and hybrid vigour, (vi) dominance and overdominance.
Define inbreeding depression and hybrid vigour. How do these phenomena atfect the self. and cross-pollinated species? Explain with the help of suitable examples.