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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 ?
Define heterosis. List its characteristic features, applications and achievements in crop improvement.
What are the man features of inbreeding depressipn? Briefly describe the degrees of inhreeding depression encountered in crop species.
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.
What is the Difference Between Heterosis and Inbreeding Depression?
What is crossing over? Give its significance.
What is recombination frequency?
Explain how Bridges’s study of non disjunction in Drosophila helped prove the chromosome theory of inheritance.
How did nondisjunction experiments help to prove the chromosome theory of inheritance? Drosophila in which nondisjunction was seen were more likely to have wild type phenotypes than others. b) Bridges isolated genetic mutants of eye color and was able to sequence the mutants. c) The results of nondisjunction were seen on d) Bridges isolated exceptional … Read more
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