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Q. No.In animal kingdom, along with XX-YY mechanism, many other variants of chromosomal sex determination mechanisms have been described such as XX-XO mechanism, ZZ-ZW mechanism ZZ-ZO mechanism and haplo-diploidy mechanism, which are present respectively in:
1.
Birds, Grasshopper, Wasp, Moth
2.
Grasshopper, Birds, Moth, Wasp
3.
Birds, Moth, Grasshopper, Wasp
4.
Grasshopper, Moth, Birds, Wasp
Subtopic: Sex Determination |
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The manifestations of phenylketonuria are given below. Choose the incorrect answer from the given options:
1. Mental retardation
2. Skin rashes
3. Excessive accumulation of phenylpyruvate in blood
4. Furrowed tongue
1. Mental retardation
2. Skin rashes
3. Excessive accumulation of phenylpyruvate in blood
4. Furrowed tongue
Subtopic: Mendelian Disorders |
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The phenomenon where a single gene exhibits multiple phenotypic expressions is called:
1. Co-dominance
2. Pleiotropy
3. Multiple alleles
4. Polygenic inheritance
1. Co-dominance
2. Pleiotropy
3. Multiple alleles
4. Polygenic inheritance
Subtopic: Polygenic Inheritance & Pleiotropy |
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A yellow seeded and violet flowered pea plant was crossed with a green seeded and white flowered pea plant. The progeny showed plants with four different phenotypes. The yellow seeded and violet flowered parent must be:
| 1. | Double homozygous |
| 2. | Double heterozygous |
| 3. | Homozygous for seed colour and heterozygous for flower colour. |
| 4. | Heterozygous for seed colour and homozygous for flower colour. |
Subtopic: Dihybrid Cross Analysis |
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Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the correct answer from the options given below:
| Assertion (A): | In honey bee population, sons do not have fathers but have grandfathers. |
| Reason (R): | Haploidy in drones of honey bee is due to parthenogenesis while fertilisation results into female bees. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Sex Determination |
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Which of the following is NOT an autosomal recessive disorder?
1. Sickle cell anemia
2. Phenylketonuria
3. Haemophilia
4. Thalassemia
1. Sickle cell anemia
2. Phenylketonuria
3. Haemophilia
4. Thalassemia
Subtopic: Mendelian Disorders | Mendelian Disorders: Hemophilia |
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A cross between tall plants was made resulting in offspring of tall and dwarf plants with ratio 3 : 1. The genotype(s) of both parents are:
1. TT and TT
2. Tt and tt
3. Tt and Tt
4. tt and tt
1. TT and TT
2. Tt and tt
3. Tt and Tt
4. tt and tt
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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ABO blood group is an example of
| 1. | Incomplete dominance | 2. | Multiple allele |
| 3. | Pleiotropy | 4. | Linkage |
Subtopic: Co-dominance |
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below.
1. Statement I is True but Statement II is False
2. Statement I is False but Statement II is True
3. Both Statement I and Statement II are True
4. Both Statement I and Statement II are False
| Statement I: | When many alleles of single gene govern a character, it is called polygenic inheritance. |
| Statement II: | In polygenic inheritance, the effect of each allele is additive |
1. Statement I is True but Statement II is False
2. Statement I is False but Statement II is True
3. Both Statement I and Statement II are True
4. Both Statement I and Statement II are False
Subtopic: Polygenic Inheritance & Pleiotropy |
Level 3: 35%-60%
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| List-I Types of inheritance |
List-II Example |
||
| A. | Incomplete dominance | I. | Blood groups in human |
| B. | Co-dominance | II. | Flower colour in Antirrhinum |
| C. | Pleiotropy | III. | Skin colour in human |
| D. | Polygenic inheritance | IV. | Phenylketonuria |
| 1. | A-III,B-IV, C-II, D-I | 2. | A-II, B-I, C-IV, D-III |
| 3. | A-II,B-III, C-I, D-IV | 4. | A-IV, B-I, C-III, D-II |
Subtopic: Miscellaneous |
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