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Q. No.Consider the given two statements:
A:
In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive.
B:
Since in an individual only two alleles can be present, multiple alleles can be found only when population studies are made.
1.
Only A is correct
2.
Only B is correct
3.
Both A and B are correct
4.
Both A and B are incorrect
Subtopic: Polygenic Inheritance & Pleiotropy | Co-dominance |
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In humans, the gene responsible for phenylketonuria (PKU) also affects skin pigmentation and intellectual development. This phenomenon is an example of:
1. Polygenic inheritance
2. Multiple alleles
3. Codominance
4. Pleiotropy
1. Polygenic inheritance
2. Multiple alleles
3. Codominance
4. Pleiotropy
Subtopic: Polygenic Inheritance & Pleiotropy |
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Which of the following was not a reason why Drosophila melanogaster were found very suitable for genetic studies?
| 1. | They could be grown on simple synthetic medium in the laboratory. |
| 2. | They complete their life cycle in about two weeks. |
| 3. | A single mating produce a very limited number of progeny flies, generally one. |
| 4. | There was a clear differentiation of the sexes – the male and female flies are easily distinguishable |
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations |
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In honey bees, males (drones) are produced by:
1. Fertilised eggs and are diploid
2. Unfertilised eggs and are haploid
3. Fertilised eggs and are haploid
4. Unfertilised eggs and are diploid
1. Fertilised eggs and are diploid
2. Unfertilised eggs and are haploid
3. Fertilised eggs and are haploid
4. Unfertilised eggs and are diploid
Subtopic: Sex Determination |
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Pleiotropy refers to a phenomenon where:
1. A single gene influences multiple traits
2. Multiple genes control a single trait
3. Two genes are located on the same chromosome
4. A trait is influenced by environmental factors
1. A single gene influences multiple traits
2. Multiple genes control a single trait
3. Two genes are located on the same chromosome
4. A trait is influenced by environmental factors
Subtopic: Polygenic Inheritance & Pleiotropy |
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The F2 phenotypic and genotypic ratios are identical in:
1. Only A and B
2. Only A and C
3. Only A
4. Only B and C
| A: | Complete dominance |
| B: | Incomplete dominance |
| C: | Co-dominance |
1. Only A and B
2. Only A and C
3. Only A
4. Only B and C
Subtopic: Monohybrid Cross: 1 | Law of Segregation and Law of Independent Assortment | Co-dominance |
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There are three alleles for the ABO blood group system in humans. What is the total number of genotypic combinations possible?
1. 3
2. 4
3. 6
4. 9
1. 3
2. 4
3. 6
4. 9
Subtopic: Co-dominance |
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Identify the correct statements:
| A: | The possibility of a female becoming a haemophilic is extremely rare. |
| B: | X-linked recessive trait shows transmission from carrier female to male progeny. |
| 1. | Only A is correct |
| 2. | Only B is correct |
| 3. | Both A and B are correct |
| 4. | Both A and B are incorrect |
Subtopic: Mendelian Disorders: Hemophilia |
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Match List-I with List-II:
Choose the correct answer from the options given below:
1. A-II, B-IV, C-III, D-I
2. A-III, B-IV, C-I, D-II
3. A-IV, B-II, C-I, D-III
4. A-IV, B-I, C-II, D-III
| List-I [Mechanism of sex determination] |
List-II [Example] |
||
| A. | XX-XO; male heterogamety | I. | Birds |
| B. | ZZ-ZW; female heterogamety | II. | Honeybees |
| C. | Haplo-diploidy | III. | Drosophila |
| D. | Genic balance | IV. | Grasshopper |
1. A-II, B-IV, C-III, D-I
2. A-III, B-IV, C-I, D-II
3. A-IV, B-II, C-I, D-III
4. A-IV, B-I, C-II, D-III
Subtopic: Sex Determination |
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In honey bees, sex is determined by:
1. Temperature-dependent mechanism
2. Number of Z chromosomes
3. Haplodiploidy mechanism
4. Presence of sex chromosomes
1. Temperature-dependent mechanism
2. Number of Z chromosomes
3. Haplodiploidy mechanism
4. Presence of sex chromosomes
Subtopic: Sex Determination |
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