Q. No.An abnormal human baby with 'XXX' sex chromosomes was born due to:
1. formation of abnormal ova in the mother
2. fusion of two ova and one sperm
3. fusion of two sperms and one ovum
4. formation of abnormal sperms in the father
1. formation of abnormal ova in the mother
2. fusion of two ova and one sperm
3. fusion of two sperms and one ovum
4. formation of abnormal sperms in the father
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offspring?
2. A, B and AB
3. A, B, AB and O
4. Only O
Which one of the following symbols and its representation, used in the human pedigree analysis is correct?
| 1. |  = Mating between relatives |
| 2. |  = Unaffected male |
| 3. |  = Unaffected female |
| 4. |  = male affected |
If a chiasma forms between the loci of genes A and B in 20% of the tetrads of an individual of genotype AB/ab, the percentage of gametes expected to be Ab is:
1. 40
2. 20
3. 10
4. 5
Phenotype of an organism is the result of:
1. mutations and linkages
2. cytoplasmic effects and nutrition
3. environmental changes and sexual dimorpgism
4. genotype and environment interactions
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Both sickle cell anaemia and Huntington’s chorea are:
1. bacteria-related diseases.
2. congenital disorders
3. pollutant-induced disorders
4. virus-related diseases
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In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red, and pink flowers. Choose the incorrect statement from the following:
| 1. | Law of Segregation does not apply in this experiment. |
| 2. | This experiment does not follow the Principle of Dominance. |
| 3. | The pink colour in F1 is due to incomplete dominance. |
| 4. | Ratio of F2 is 1/4(red):2/4(pink):1/4(white). |
Select the incorrect statement:
| 1. | Human males have one of their sex-chromosome much shorter than the other. |
| 2. | Male fruit fly is heterogametic. |
| 3. | In male grasshoppers, 50% of sperms have no sex chromosome. |
| 4. | In domesticated fowls, the sex of progeny depends on the type of sperm rather than the egg. |
What map unit (Centimorgan) is adopted in the construction of genetic maps?
| 1. | A unit of distance between genes on chromosomes, representing 50% cross-over. |
| 2. | A unit of distance between two expressed genes, representing 10% cross-over. |
| 3. | A unit of distance between two expressed genes, representing 100% cross-over. |
| 4. | A unit of distance between genes on chromosomes. representing 1% cross-over. |
The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by:
| 1. | Sutton Boveri | 2. | T.H. Morgan |
| 3. | Gregor J. Mendel | 4. | Alfred Sturtevant |
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