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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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 |
60%
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 |
83%
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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Identify the incorrectly matched pair:
| 1. | Pleiotropy | Sickle cells anaemia |
| 2. | Polygenic inheritance | Human skin colour |
| 3. | Multiple allelism | ABO blood group |
| 4. | Gene/point mutation | Down’s syndrome |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
60%
From NCERT
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