Q. No.A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by:
1. Only daughters 2. Only sons 3. Only grandchildren 4. Both sons and daughters
Match the terms in Column-I with their description in Column-II and choose the correct option.
| Column-I | Column-II | ||
| A. | Dominance | 1. | Many govern a single character |
| B. | Codominance | 2. | In a heterozygous organism, only one allele expresses itself |
| C. | Pleiotropy | 3. | In a heterozygous organism, both alleles express themselves fully |
| D. | Polygenic inheritance | 4. | A single gene influences many characters |
| A | B | C | D | |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 4 | 1 | 2 | 3 |
| 3. | 4 | 3 | 1 | 2 |
| 4. | 2 | 1 | 4 | 3 |
A cell at the telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at the telophase stage. There is no formation of a cell plate and thus the cell is containing more chromosomes as compared to other dividing cells. This would result in:
1. polyploidy
2. somaclonal variation
3. polyteny
4. aneuploidy
| 1. | Mutations destroy telomerase inhibitor |
| 2. | Mutations inactivate the cell control |
| 3. | Mutations inhibit the production of telomerase |
| 4. | Mutations in proto–oncogenes accelerate the cell cycle |
The movement of a gene from one linkage group to another is called:
| 1. | inversion | 2. | duplication |
| 3. | translocation | 4. | crossing over |
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
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
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). |
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