Discuss the physiological bases of heterosis.
Discuss the physiological bases of heterosis.
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Botany
204 Questions
1 Answer 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.
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.
1 Answer 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 ?
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 ?
1 Answer Define heterosis. List its characteristic features, applications and achievements in crop improvement.
Define heterosis. List its characteristic features, applications and achievements in crop improvement.
1 Answer What are the man features of inbreeding depressipn? Briefly describe the degrees of inhreeding depression encountered in crop species.
What are the man features of inbreeding depressipn? Briefly describe the degrees of inhreeding depression encountered in crop species.
1 Answer 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.
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.
1 Answer Define inbreeding depression and hybrid vigour. How do these phenomena atfect the self. and cross-pollinated species? Explain with the help of suitable examples.
Define inbreeding depression and hybrid vigour. How do these phenomena atfect the self. and cross-pollinated species? Explain with the help of suitable examples.
1 Answer What is the Difference Between Heterosis and Inbreeding Depression?
What is the Difference Between Heterosis and Inbreeding Depression?
1 Answer Water flows upward in some xylem tubes and downward in others. a) True b) False
Water flows upward in some xylem tubes and downward in others. a) True b) False
1 Answer Bacteria-containing nodules in the roots of legume plants aid in the utilization of: a) trace elements. b) carbon dioxide. c) nitrogen. d) water. e) phosphates.
Bacteria-containing nodules in the roots of legume plants aid in the utilization of: a) trace elements. b) carbon dioxide. c) nitrogen. d) water. e) phosphates.
1 Answer
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