Q. No.A gene showing codominance has:
1.
alleles tightly linked on the same chromosome
2.
alleles that are recessive to each other
3.
both alleles independently expressed in the heterozygote
4.
one allele dominant on the other
In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates:
1. Both of the characters are controlled by more than one gene.
2. The two genes are located on two different chromosomes.
3. Chromosomes failed to separate during meiosis.
4. The two genes are linked and present on the same chromosome.
Which of the following most appropriately describes haemophilia?
| 1. | Dominant gene disorder |
| 2. | Recessive gene disorder |
| 3. | X-linked recessive gene disorder |
| 4. | Chromosomal disorder |
A cell at the telophase stage is observed by a student in a plant 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 the cell plate and thus the cell is containing more chromosomes as compared to other dividing cells. This would result in:
1. Polyteny
2. Aneuploidy
3. Polyploidy
4. Somaclonal variation
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The mechanism that causes a gene to move from one linkage group to another is called
1. Crossing-over
2. inversion
3. duplication
4. translocation
Which one from those given below are the periods for Mendel's hybridization experiments?
1. 1856 - 1863
2. 1840 - 1850
3. 1857 - 1869
4. 1870 – 1877
Among the following characters, which one was not considered by Mendel in his experiments on pea?
1. Stem - Tall or Dwarf
2. Trichomes - Glandular or non-glandular
3. Seed - Green or Yellow
4. Pod - Inflated or Constricted
The genotypes of a Husband and Wife are IAIB and IAi .
Among the blood types of their children how many different genotypes and phenotypes are possible
1. 3 genotypes ; 3 phenotypes
2. 3 genotypes; 4 phenotypes
3. 4 genotypes ; 3 Phenotypes
4. 4 genotypes ; 4 phenotypes
Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement :
| 1. | Both are due to a qualitative defect in globin chain synthesis. |
| 2. | Both are due to a quantitative defect in globin chain synthesis. |
| 3. | Thalassemia is due to less synthesis of globin molecules. |
| 4. | Sickle cell anemia is due to a quantitative problem of globin molecules |
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