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
Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |
88%
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 |
85%
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% |
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
From NCERT
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The karyotype of a person suffering from Down’s syndrome will show:
| 1. | 44 Autosomes + XXY |
| 2. | 44 Autosomes + XO |
| 3. | 45 Autosomes [trisomy #21] + XY |
| 4. | 43 Autosomes [monosomy #21] + XY |
Subtopic: Non - Disjunction & Aneuploidy |
85%
From NCERT
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Identify the incorrect statement regarding thalassemia:
| 1. | There is reduced synthesis of one of the globin chains. |
| 2. | It is an autosome-linked dominant blood disease. |
| 3. | Alpha thalassemia is controlled by two closely linked genes on chromosome 16. |
| 4. | Beta thalassemia is controlled by a single gene on chromosome 11. |
Subtopic: Additional Note on Thalassemia |
86%
From NCERT
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Antirrhinum majus with pink flowers was cross pollinated by Antirrhinum majus with white flowers. What proportion of progeny plants are expected to have white flowers?
1. 0
2. ¼
3. ½
4. ¾
1. 0
2. ¼
3. ½
4. ¾
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
61%
From NCERT
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When two genes in a dihybrid cross are situated on the same chromosome close to each other, the proportion of parental gene combinations is:
| 1. | much higher than the non-parental type |
| 2. | much lower than the non-parental type |
| 3. | equal to the non-parental type |
| 4. | not seen at all |
Subtopic: Linkage Types | Recombination & Gene Mapping |
84%
From NCERT
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Which of the following is not true regarding phenylketonuria?
| 1. | It is inherited as an autosomal recessive condition. |
| 2. | The affected individual lacks the enzyme phenylalanine hydroxylase. |
| 3. | The affected individuals lack the capability of converting tyrosine to phenylalanine. |
| 4. | Clinical features include mental retardation and a reduction in hair and skin pigmentation. |
Subtopic: Mendelian Disorders |
80%
From NCERT
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