Q. No.
The year 1900 AD is highly significant for geneticists due to:
1. discovery of genes
2. Principle of linkage
3. Chromosome theory of heredity
4. Rediscovery of Mendelism
1. discovery of genes
2. Principle of linkage
3. Chromosome theory of heredity
4. Rediscovery of Mendelism
1. First filial generation
2. First seed generation
3. First flowering generation
4. First fertile generation
1. Single gene
2. 3 pairs of genes
3. 2 pairs of genes
4. 2 pairs of genes with an intragene
1. AA x Aa
2. AA xaa
3. AaxAa
4. Aa x AA
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 |
What is the genetic disorder in which an individual has an overall masculine development gynaecomastia, and is sterile?
| 1. | Down's syndrome | 2. | Turner's syndrome |
| 3. | Klinefelter's syndrome | 4. | Edward syndrome |
Assertion: Dominance is not always an autonomous feature of gene or its product.
Reason: Occasionally a single gene product may produce more than one effects.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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