Q. No.Which of the following is correct to check the inbreeding depression ?
1. Artificial hybridisation
2. Cross breeding
3. Selected animal should be mated with unrelated superior animals of the same breed
4. Selected animal should be mated with unrelated superior animals of the different breed
Read the following statement and select the right choice
i. Semi-dwarf varieties, Jaya and Ratna were
developed in IRRI, Phillippines.
ii. Classical plant breeding involves crossing or
hybridization of pure lines.
iii. Saccharum barberi was originally grown in
South India.
iv. Genetic variability is the root of any breeding
programme.
1. Only i is correct.
2. ii and iv are correct.
3. i, ii and iii are correct.
4. ii, iii and iv are correct.
Select the incorrect statement(s) (with respect to semi-dwarf varieties of wheat)
1. Developed by Norman E.Borlaug
2. Developed at International Centre for Wheat and Maize Improvement in Mexico
3. These varieties were derived from IR-8
4. Responsible for green revolution
Which of the following disease is caused by viruses in plants?
1. Brown rust of wheat
2. Turnip mosaic
3. Red rot of sugarcane
4. Late blight of potato
Select the incorrect statement regarding inbreeding:
| 1. | Inbreeding helps in elimination of deleterious alleles from the population |
| 2. | Inbreeding is necessary to evolve a pure-line in any animal |
| 3. | Continued inbreeding reduces fertility and leads to inbreeding depression. |
| 4. | Inbreeding depression cannot be overcome by out-crossing. |
In mung bean, resistance to yellow mosaic virus, and powdery mildew was brought about by:
1. Mutation breeding
2. Biofortification
3. Tissue culture
4. Hybridization and selection
Major drawback of inbreeding is
1. Increase in homozygosity
2. Decrease in immunity
3. Reduction in fertility
4. Increase in food consumption
Choose incorrect option :
1. More than 70 % of world livestock population is in India and China
2. Milk yielding capacity of buffaloes is three times more as compared to cows
3. Buffalo milk is superior to cow milk with respect to fat and mineral content
4. Continuous inbreeding increases the productivity of milk
Hisardale a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Merino rams is an example of
1. Outcrossing
2. Cross-breeding
3. Interspecific hybridisation
4. Outbreeding
Select the incorrect statement:
| 1. | Inbreeding helps in the accumulation of superior genes and the elimination of undesirable genes |
| 2. | Inbreeding increases homozygosity |
| 3. | Inbreeding is essential to evolve pure lines in any animal |
| 4. | Inbreeding selects harmful recessive genes that reduce fertility and productivity |
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