Q. No.If a colourblind man marries a woman who is homozygous for normal colour vision, the probability of their son being colourblind is:
1.
0
2.
0.5
3.
0. 75
4.
1
Which one from those given below is the period for Mendel's hybridization experiments?
| 1. | 1840-1850 | 2. | 1857-1869 |
| 3. | 1870-1877 | 4. | 1856-1863 |
| 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 |
How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?
| 1. | Five | 2. | Six |
| 3. | Eight | 4. | Seven |
The movement of a gene from one linkage group to another is called:
| 1. | inversion | 2. | duplication |
| 3. | translocation | 4. | crossing over |
Multiple alleles are present:
1. on different chromosomes
2. at different loci on the same chromosome
3. at the same locus of the chromosome
4. on non-sister chromatids
| 1. | Incomplete dominance | 2. | Partial dominance |
| 3. | Complete dominance | 4. | Codominance |
Which of the following statements is not true of two genes that show 50% recombination frequency?
| 1. | The genes are tightly linked. |
| 2. | The genes show independent assortment. |
| 3. | If the genes are present on the same chromosome, they undergo more than one crossing-over in every meiosis. |
| 4. | The genes may be on different chromosomes. |
The incorrect statement with regard to Haemophilia is:
| 1. | It is a recessive disease |
| 2. | It is a dominant disease |
| 3. | A single protein involved in the clotting of blood is affected |
| 4. | it is a sex-linked disease. |
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. |
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