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
| I: | Haemophilia is a sex-linked recessive disease. |
| II: | Down’s syndrome is due to aneuploidy. |
| III: | Phenylketonuria is an autosomal recessive gene disorder. |
| IV: | Sickle cell anaemia is an X-linked recessive gene disorder |
2. I, III and IV are correct
3. I, II and III are correct
4. I and IV are correct
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 |
A colour-blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind? (consider the grandsons only through son)
1. 0.5
2. 1
3. Nil
4. 0.25
In his classic experiments on pea plants Mendel did not use?
1. Seed color
2. Pod length
3. Seed shape
4. Flower position
A pleiotropic gene:
| 1. | Is expressed only in primitive plants |
| 2. | Is a gene that evolved during Pliocene |
| 3. | Controls a trait only in combination with another gene |
| 4. | Controls multiple traits in an individual |
The movement of a gene from one linkage group to another is called:
2. duplication
3. translocation
4. crossing over
Fruit colour in squash is an example of:
1. Recessive epistasis
2. Dominant epistasis
3. Complementary genes
4. Inhibitory genes
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