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Q. No.Consider a test cross between a homozygous recessive yellow-seeded plant with a plant having an unknown seed. 50% of the offspring in the F1 generation have yellow seeds and 50% have green seeds.
Which of the following statements is/are TRUE about the cross?
1. The unknown seed is homozygous recessive for green.
2. The unknown seed is heterozygous for green.
3. All the offspring in the F2 generation will have green seeds.
4. All the offspring in the F2 generation will have yellow seeds.
1. Only 1.
2. Only 2
3. Only 1 and 4.
4. Only 2 and 3.
Subtopic: Monohybrid Cross: Further Understanding |
73%
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In a cross between full green pods (FFGC) and constricted yellow pads (ffgg), the percentage of heterozygous dominant offsprings in F1 is:
1. \(25 \%\).
2. \(50 \%\).
3. \(75 \%\).
4. \(100 \%\).
1. \(25 \%\).
2. \(50 \%\).
3. \(75 \%\).
4. \(100 \%\).
Subtopic: Dihybrid Cross: General Consideration |
59%
From NCERT
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A single gene is usually seen to exhibit a single phenotypic expression. Pleiotropic genes. however, can impact multiple phenotypic expressions.
Which of these genetic disorders have multiple phenotypic expressions being impacted by a change in a single gene?
1. Thalassemia
2. Haemophilia
3. Phenylketonuria
4. Down's syndrome
Which of these genetic disorders have multiple phenotypic expressions being impacted by a change in a single gene?
1. Thalassemia
2. Haemophilia
3. Phenylketonuria
4. Down's syndrome
Subtopic: Polygenic Inheritance & Pleiotropy |
88%
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If dark skin colour is controlled by the dominant gene MNO and its recessive allele is mno, what can be DEFINITELY said about the offspring that are dark-skinned?
1. They all have two copies of the dominant alleles.
2. They have at least one copy of the dominant allele.
3. They all have very high exposure to sunlight.
4. They do not have any exposure to sunlight.
1. They all have two copies of the dominant alleles.
2. They have at least one copy of the dominant allele.
3. They all have very high exposure to sunlight.
4. They do not have any exposure to sunlight.
Subtopic: Polygenic Inheritance & Pleiotropy |
54%
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The first scientists to isolate DNA in pure form were:
1. Avery, MacLeod and McCarty
2. Hershey and Chase
3. Nirenberg and Meithei
4. Cohen and Boyer
1. Avery, MacLeod and McCarty
2. Hershey and Chase
3. Nirenberg and Meithei
4. Cohen and Boyer
Subtopic: Chromosomal Basis of Inheritance: Introduction |
From NCERT
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Genetics deals with:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | the process by which characters are passed on from parent to progeny. |
| II: | the degree by which progeny differ from their parents. |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Introduction to Genetics: 1 |
85%
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During Mendel’s investigations into inheritance patterns, it was for the first time that:
| I: | artificial hybridisation experiments were carried out. |
| II: | statistical analysis and mathematical logic were applied to problems in biology. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Chromosomal Basis of Inheritance: Introduction |
57%
From NCERT
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What would be the number of types of gametes produced by a plant with genotype AaBbCc [assume independent assortment between all loci]?
1. 6
2. 8
3. 9
4. 16
1. 6
2. 8
3. 9
4. 16
Subtopic: Dihybrid Cross Analysis |
82%
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In a typical dihybrid cross \(A a B b \times A a B b\) [symbols have usual meanings; assume independent assortment], what proportion of progeny are expected to carry both dominant alleles?
1. ¼
2. 9/16
3. 3/16
4. ½
1. ¼
2. 9/16
3. 3/16
4. ½
Subtopic: Dihybrid Cross Analysis |
69%
From NCERT
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Consider the given two statements:
| Statement I: | Genes are the units of inheritance and contain the information that is required to express a particular trait in an organism. |
| Statement II: | Genes which code for a pair of contrasting traits are known as alleles, i.e., they are slightly different forms of the same gene |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Monohybrid Cross: Further Understanding |
93%
From NCERT
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