Q. No.A woman receives her X chromosomes from:
1. her mother only
2. her father only
3. both her mother and her father
4. extranuclear DNA in her mother's egg
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Sickle cell anaemia has not been eliminated from the African population because:
1. It is controlled by recessive genes
2. It is not a fatal disease
3. It provides immunity against malaria
4. It is controlled by dominant genes
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 inheritance of flower colour in dog flower and 4’O clock plant exhibits:
| 1. | Complete dominance | 2. | Incomplete dominance |
| 3. | Co-dominance | 4. | Lethality |
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Occasionally, a single gene product may produce more than one effect. Such a gene is said to be:
| 1. | Pleiotropic | 2. | Polygenic |
| 3. | Psuedoallele | 4. | Housekeeping |
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The mechanism of sex determination in grasshoppers is:
| 1. | XX – XY; male heterogamety |
| 2. | XX – XY; female heterogamety |
| 3. | XX – XO; male heterogamety |
| 4. | XX – XO; female heterogamety |
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A plant, on repeated self-pollination, preserves the trait expressed for many generations. Such a plant is said to be:
| 1. | Panmictic | 2. | Homologous |
| 3. | Apomictic | 4. | Pure line |
What is the F2 phenotypic ratio in cases of incomplete dominance?
| 1. | 1 : 1 | 2. | 3 : 1 |
| 3. | 1 : 2 : 1 | 4. | 1 : 1 |
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The famous double helix model of DNA was proposed by Watson and Crick in ____ and they shared Nobel Prize for Physiology or Medicine in ________ for their effort.
| 1. | 1951, 1971 | 2. | 1943, 1963 |
| 3. | 1953, 1962 | 4. | 1969, 1972 |
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Which of the following is a recessive trait for a character chosen by Mendel in garden pea?
| 1. | Violet flower colour | 2. | Yellow pod colour |
| 3. | Axial flower position | 4. | Tall stem height |
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