Q. No.The ultimate source of allelic variation is:
1.
Recombination
2.
Natural selection
3.
Mutation
4.
Drift
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Which of the following was not a character studied by Mendel in garden pea?
| 1. | Flower position | 2. | Pod shape |
| 3. | Flower colour | 4. | Pod position |
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What can be the blood groups of progeny whose father and mother are of AB and O blood groups, respectively?
| 1. | A and B only | 2. | AB only |
| 3. | All except O | 4. | A, B, AB, and O |
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In the case of starch synthesis in pea seeds [controlled by the B gene], BB homozygotes produce large and round starch grains; bb homozygotes produce smaller and wrinkled starch grains and heterozygotes produce round seeds of intermediate size. What can be inferred from this observation?
| 1. | The gene B mutates at a faster rate |
| 2. | The gene B is easily influenced by the environment |
| 3. | Dominance is not an autonomous feature of a gene or the product that it has information for. |
| 4. | Some genes do not follow the law of segregation. |
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All generations in Mendel’s Experiments were produced by self pollination except:
| 1. | P | 2. | F1 |
| 3. | F2 | 4. | F3 |
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In birds, the mechanism of sex determination is:
| 1. | XX – XY; male heterogamety |
| 2. | ZZ – ZW; female heterogamety |
| 3. | XX – XO; male heterogamety |
| 4. | ZZ – ZW; male heterogamety |
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When the two genes in a dihybrid cross are situated on the same chromosome:
| 1. | The proportion of parental gene combinations was much higher than the non-parental type. |
| 2. | The proportion of parental gene combinations was much lesser than the non-parental type. |
| 3. | The proportion of parental gene combinations was equal to the non-parental type. |
| 4. | Only recombinants are formed. |
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In a test cross, the plant expressing the dominant phenotype is crossed with the plant:
| 1. | Which is heterozygous dominant |
| 2. | Which is heterozygous recessive |
| 3. | Which is homozygous recessive |
| 4. | Which is homozygous dominant |
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Identify the incorrect statement:
| 1. | In addition to recombination, the mutation is another phenomenon that leads to variation in DNA. |
| 2. | Chromosomal aberrations are commonly observed in cancer cells. |
| 3. | A classical example of a point mutation is sickle cell anemia. |
| 4. | Non-ionising radiations cannot be mutagens. |
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What is incorrect for Hemophilia?
| 1. | In this disease, a single protein that is a part of the cascade of proteins involved in the clotting of blood is affected. |
| 2. | In an affected individual, a simple cut will result in non-stop bleeding. |
| 3. | The heterozygous female (carrier) for haemophilia may transmit the disease to her sons. |
| 4. | The possibility of a female becoming haemophilic is extremely rare because the mother of such a female has to be hemophilic and the father should be a carrier. |
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