Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross is known as:
1. Test cross
2. Reciprocal cross
3. Dihybrid cross
4. Reverse cross
The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes:
1. Seven
2. Six
3. Five
4. Four
Which one of the following traits of garden peas studied by Mendel was a recessive feature?
1. | Axial flower position |
2. | Green seed colour |
3. | Green pod colour |
4. | Round seed shape |
Which one of the following conditions, though harmful in itself, is also a potential saviour from a mosquito-borne infectious disease?
1. | Thalassaemia | 2. | Sickle cell anaemia |
3. | Pernicious anaemia | 4. | Leukemia |
Pattern baldness, moustaches, and beard in human males are examples of:
1. Sex-linked traits
2. Sex-limited traits
3. Sex-differentiating traits
4. Sex-determining traits
When a cluster of genes shows linkage behaviour they:
1. Do not show a chromosome map
2. Show recombination during meiosis
3. Do not show independent assortment
4. Induce cell division
Christmas disease is another name for:
1. Haemophilia B
2. Hepatitis B
3. Down's syndrome
4. Sleeping sickness
In Drosophila, the sex is determined by:
1. | The ratio of the number of X-chromosomes to the sets of autosomes |
2. | X and Y chromosomes |
3. | The ratio of pairs of X-chromosomes to the pairs of autosomes |
4. | Whether the egg is fertilized or develops parthenogenetically |
A genetic map is one that:
1. Establishes sites of the genes on a chromosome
2. Establishes the various stages in gene evolution
3. Shows the stages during the cell division
4. Shows the distribution of various species in a region
Independent assortment of genes does not take place when:
1. | Genes are located on homologous chromosomes |
2. | Genes are linked and located on the same chromosome |
3. | Genes are located on non-homologous chromosome |
4. | All the above |