Q. No.When there is a change in the chromosome number such that the changes number is not an exact multiple of base number [haploid number], the condition is called as:
1.
Euploidy
2.
Aneuploidy
3.
Aberration
4.
Non-disjunction
On self-pollinated a tall F2 plant, the progeny can be:
| 1. | Tall only | 2. | Dwarf only |
| 3. | Intermediate in height | 4. | Tall and Dwarf |
Mutations that arise due to changes in a single base pair of DNA are called as:
| 1. | Chromosomal aberrations | 2. | Point mutations |
| 3. | Nonsense mutations | 4. | Frameshift mutations |
The inheritance of IA and IB allele exhibit:
| 1. | Complete dominance | 2. | Incomplete dominance |
| 3. | Co-dominance | 4. | Lethality |
In humans, the mechanism of sex determination is:
| 1. | XX – XY; male heterogamety |
| 2. | XX – XY; female heterogamety |
| 3. | XX – XO; male heterogamety |
| 4. | XX – XO; female heterogamety |
When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny, the F2 ratio deviated very significantly from the 9:3:3:1 ratio. This can be attributed to the fact that:
| 1. | The genes are located on the X and Y chromosomes. |
| 2. | Fruit fly has abnormal chromosomes. |
| 3. | The genes are located on the X chromosome. |
| 4. | The genes exhibit incomplete dominance. |
In a dissimilar situation, the unit factor that expresses itself is called as:
| 1. | Dominant | 2. | Recessive |
| 3. | Epistatic | 4. | Hypostatic |
The number of alleles, the genotypic combinations, and phenotypes in the ABO system are respectively:
| 1. | 3, 6 and 4 | 2. | 3, 4 and 6 |
| 3. | 2, 3 and 4 | 4. | 2, 3, and 6 |
Thalassemia is inherited as a/an ____________ condition.
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex linked recessive | 4. | Sex linked dominant |
The family pedigree of Queen Victoria shows a number of haemophilic descendants as she was:
| 1. | Affected by the disease |
| 2. | Carrier for the disease |
| 3. | Did not carry the allele for hemophilia |
| 4. | Was not a queen |
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