The probability of four sons to a couple is:
1. | 1/4 | 2. | 1/8 |
3. | 1/16 | 4. | 1/32 |
Sickle cell anaemia is due to:
1. | Change of Amino Acid in α-chain of Haemoglobin. |
2. | Change of Amino Acid in β-chain of Haemoglobin. |
3. | Change of Amino acid in both α and β chains of Haemoglobin. |
4. | Change of Amino acid either α or β chain of Haemoglobin. |
When dominant and recessive alleles express themselves together it is called:
1. Co-dominance
2. Dominance
3. Amphidominance
4. Pseudo dominance
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 |
The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called:
1. Punnett square
2. Net square
3. Bullet square
4. Punch square
In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?
1. | 25% | 2. | 100% |
3. | 50% | 4. | 75% |
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
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
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 |
The linkage map of the X-chromosome of fruitfly has 66 units, with yellow body gene (y) at one end and bobbed hair (b) gene at the other end. The recombination frequency between these two genes (y and b) should be:
1. 60%
2. > 50%
3. ≤ 50%
4. 100%