Q. No.A cell at the telophase stage is observed by a student in a brought from the field. He tells his teacher that this cell is not like other cells at the telophase stage. There is no formation of a cell plate and thus the cell is containing more chromosomes as compared to other dividing cells. This would result in:
1. polyploidy
2. somaclonal variation
3. polyteny
4. aneuploidy
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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
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| 1. | XO type of sex chromosomes determines male sex in grasshopper |
| 2. | XO condition in humans as found in Turner syndrome, determines female sex |
| 3. | Homozygous sex chromosomes (XX) produce males in Drosophila |
| 4. | Homozygous sex chromosomes (ZZ) determine the female sex in birds. |
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Study the pedigree chart given below:
What does it show?
| 1. | Inheritance of a sex-linked inborn error of metabolism |
| 2. | Inheritance of a condition like phenylketonuria as an autosomal recessive trait |
| 3. | The pedigree chart is wrong as this is not possible |
| 4. | Inheritance of a recessive sex-linked disease like haemophilia |
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In Mendel's experiments with garden peas, round seed shape (RR) was dominant over wrinkled seeds (rr), and yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?
| 1. | Only round seeds with green cotyledons |
| 2. | Only wrinkled seeds with yellow cotyledons |
| 3. | Only wrinkled seeds with green cotyledons |
| 4. | Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons |
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2. 3:1 :: Tall : Dwarf
3. 3:1:: Dwarf : Tall
4. 1:2:1:: Tall homozygous : Tall heterozygous : Dwarf
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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
Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement:
| 1. | Both are due to a quantitative defect in globin chain synthesis |
| 2. | Thalassemia is due to less synthesis of globin molecules |
| 3. | Sickle cell anemia is due to a quantitative problem of globin molecules |
| 4. | Both are due to a qualitative defect in globin chain synthesis |
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In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine?
1. G GG
2. A A G
3. G A A
4. G U G
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