BiologyNEB 2076 (old course)
Describe in brief on any five. a) Significances of respiration. b) Describe the tunica and corpus theory. c) Structure of RNA. d) Mechanism of crossing over. e) Application of plant tissue culture.…
15Describe in brief on any five.
- a) Significances of respiration.
- b) Describe the tunica and corpus theory.
- c) Structure of RNA.
- d) Mechanism of crossing over.
- e) Application of plant tissue culture.
- f) Process of male gametogenesis.
- g) Describe the co-dominance with suitable example.
Answer
| IA | IB
-------|----|---- IA |IAIA|IAIB IB |IAIB|IBIB
- Genotypic ratio: 1 IAIA : 2 IAIB : 1 IBIB.
- Phenotypic ratio: 1 A : 2 AB : 1 B.
Other Examples of Co-dominance:
- Cattle Coat Color:
- Red (RR) × White (WW) → Roan (RW) (red and white hairs).
- Andalusian Chickens:
- Black (B) and White (W) alleles produce speckled feathers in heterozygotes.
- Molecular Markers:
- PCR-based genotyping often shows **co-dominant bands
Discussion
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