Q. No.A woman with two genes (one on each X-chromosome) for haemophilia and one gene for colour blindness on the X-chromosome marries a normal man. How will the progeny be?
1.
All sons and daughters are haemophilic and colour blind
2.
Haemophilic and colour blind daughters
3.
50% haemophilic colour blind sons and 50% haemophilic sons
4.
50% haemophilic daughters and 50% colour blind daughters
A hereditary disease which is never passed on from father to son is:
1. X-chromosomal linked disease
2. Autosomal linked disease
3. Y-chromosomal linked disease
4. None of the above
A polygenic inheritance in human beings is:
1. skin colour
2. sickle cell anaemia
3. colour blindness
4. phenylketonuria
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. |
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