Q. No.In true breeding, the allelic pair of genes are:
1.
Homologous
2.
Linked
3.
Stable
4.
Homozygous
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What proportion of progeny in F2 generation in a Mendel monohybrid cross resembled the parent [of P generation] that expressed the recessive trait?
| 1. | ¼ | 2. | ½ |
| 3. | ¾ | 4. | 2/3 |
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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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