Which of the following is a dominant trait in Pisum sativum?
1. Yellow pod colour
2. Green seed colour
3. Axial flower position
4. Constricted pod shape
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 | Monohybrid Cross: 1 |
82%
From NCERT
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A pure tall plant is crossed with a hybrid tall plant [tall completely dominant over dwarf]. What proportion of progeny is expected to be dwarf?
1. 0
2. ½
3. ¼
4. ¾
1. 0
2. ½
3. ¼
4. ¾
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
80%
From NCERT
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The strength of linkage between two genes will be:
1. higher if the genes are farther from each other
2. higher if the genes are closer to each other
3. higher if gametic coupling is present
4. higher if gametic repulsion is present
Subtopic: Understanding Linkage | Recombination & Gene Mapping |
83%
From NCERT
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Study the given diagram and select the best option:
| 1. | The mating between I-1 and I-II is consanguineous |
| 2. | The first born child of I-1 and I-II is a male |
| 3. | The first born child of I-1 and I-II is a female |
| 4. | The first born child of I-1 and I-II is affected by a genetic disease |
Subtopic: Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
69%
From NCERT
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It is possible to induce mutations artificially through the use of radiations. Which of the following is especially suitable for inducing mutations in plants?
1. X rays
2. UV rays
3. γ rays
4. PEG
1. X rays
2. UV rays
3. γ rays
4. PEG
Subtopic: Mutation |
59%
From NCERT
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A person suffering from Klinefelter’s syndrome:
1. has 45 autosomes
2. is likely to have short stature and webbed neck
3. can develop Gynecomastia
4. has normal fertility
1. has 45 autosomes
2. is likely to have short stature and webbed neck
3. can develop Gynecomastia
4. has normal fertility
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
87%
From NCERT
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Identify the option where the names of scientists given in Column I are not correctly matched with their contribution to the science of genetics:
| COLUMN I | COLUMN II | |
| 1. | De Vries, Correns, Tschermak | Disproved Mendel’s law of Independent Assortment |
| 2. | Sutton and Boveri | Gave the chromosomal theory of inheritance |
| 3. | Alfred Sturtevant | Developed the first genetic map |
| 4. | T. H. Morgan | Discovery of the white-eyed mutation in the fruit fly |
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations | Linkage Types | Recombination & Gene Mapping |
78%
From NCERT
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While carrying out a dihybrid cross [a mating of two organisms heterozygous for two traits], a phenotype ratio of 9:3:3:1 in the offspring is expected when:
| 1. | the genes are linked [located on the same chromosome |
| 2. | each gene contains two mutations |
| 3. | the gene pairs assort independently during meiosis |
| 4. | the alleles of both genes show either co-dominance or incomplete dominance |
Subtopic: Dihybrid Cross Analysis | Dihybrid Cross: General Consideration |
84%
From NCERT
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A female is a "carrier" for the trait red color blindness [remember this trait is X-linked and colour blindness is sex-linked recessive condition], marries a normal male. What proportion of their female progeny will be affected by the disorder?
1. ¾
2. ½
3. ¼
4. 0
1. ¾
2. ½
3. ¼
4. 0
Subtopic: Mendelian Disorders |
75%
From NCERT
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Sickle cell anaemia is inherited as an autosomal recessive condition. What proportion of progeny will be normal as a result of mating between two individuals who are carriers for the trait but are themselves not affected?
1. 25%
2. 100%
3. 50%
4. 75%
1. 25%
2. 100%
3. 50%
4. 75%
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
From NCERT
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