Q. No.During his observation of spermatogenesis in a few insects, Henking found that a nuclear structure was received by 50 % of the sperms. He called this structure as:
1.
X – body
2.
Y–body
3.
X – chromosome
4.
Y – chromosome
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The expression of only one of the parental characters in a monohybrid cross in the F1, the expression of both in the F2 and the proportion of 3:1 obtained at the F2 can be explained by:
1. Law of Dominance
2. Law of segregation
3. Law of Independent Assortment
4. Two-factor interaction
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Which of the following is not an X – linked recessive disorder in humans?
1. Red-green colour blindness
2. Haemophilia
3. Duchenne muscular dystrophy
4. Vitamin D-resistant rickets
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 |
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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 |
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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 |
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The inheritance of IA and IB allele exhibit:
| 1. | Complete dominance | 2. | Incomplete dominance |
| 3. | Co-dominance | 4. | Lethality |
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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 |
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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. |
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In a dissimilar situation, the unit factor that expresses itself is called as:
| 1. | Dominant | 2. | Recessive |
| 3. | Epistatic | 4. | Hypostatic |
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