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 |
Mendel obtained wrinkled seeds in peas due to the deposition of sugars instead of starch. It was due to which enzyme:
1. Amylase
2. Invertase
3. Diastase
4. Absence of starch branching enzyme
The ratio of complementary genes is:
1. 9 : 3 : 4
2. 12 : 3 : 1
3. 9 : 3 : 3 : 4
4. 9 : 7