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Q. No.Select the correct statements with respect to pleiotropism
| (a) | A gene is said to be pleiotropy if it affects more than one trait |
| (b) | Phenylketonuria is an example of pleiotropy |
| (c) | A condition where one gene has several alleles is referred to as pleiotropism |
| (d) | A trait is said to be pleiotropic if several genes control it |
Choose the correct answer from the options given below:
| 1. | (a) and (b) only | 2. | (a) and (d) only |
| 3. | (a), (b) and (c) only | 4. | (b) ,(c) and (d) only |
Subtopic: Polygenic Inheritance & Pleiotropy |
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Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | A father will never pass the gene for haemophilia to his sons. |
| Reason (R): | Haemophilia is sex-linked (X-linked) recessive traits. |
In the light of the above statements, choose the correct answer from the options given below.
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Mendelian Disorders: Hemophilia |
70%
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Match List-I with List-II
| List-I | List-II |
| (a) Haemophilia | (i) Inborn error of metabolism which lacks an enzyme that converts phenylalanine into tyrosine |
| (b) Down's Syndrome | (ii) Sex-linked recessive disorder defect in blood coagulation |
| (c)Phenylketonuria | (iii) Presence of additional copy of X-chromosome (44+XXY) |
| (d) Klinefelter's Syndrome | (iv) Additional copy of chromosome number 21 |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iv) | (i) | (iii) |
| 2. | (iv) | (ii) | (i) | (iii) |
| 3. | (ii) | (iii) | (i) | (iv) |
| 4 | (i) | (ii) | (iii) | (iv) |
Subtopic: Mendelian Disorders | Chromosomal Disorders |
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Assuming that the fur colour of an animal is dark, the range of colour shades vary between dark and white. A cross is made between a male (AABBCC) with dark fur colour and a female (aabbcc) with white fur colour. What would be the fur colour of F1 generation?
1. All intermediate colour
2. Range of colour shade
3. All dark colour
4. All white colour
Subtopic: Polygenic Inheritance & Pleiotropy |
73%
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In Drosophila, the genes for color of body and color of eyes are situated on _______.
| 1. | both the sex chromosomes | 2. | autosomes |
| 3. | Y-chromosome | 4. | X-chromosome |
Subtopic: Sex Determination |
66%
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A low frequency recombination indicates that the genes are:
1. Located far apart from each other
2. Located close to each other
3. Not linked
4. Present on different chromosomes
Subtopic: Linkage Types | Recombination & Gene Mapping |
83%
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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 :
| Statement I: | Sickle cell anaemia and Haemophilia are autosomal dominant traits. |
| Statement II: | Sickle cell anaemia and Haemophilia are disorders of the blood. |
| 1. | Both Statement I and Statement II are correct |
| 2. | Both Statement I and Statement II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Mendelian Disorders: Sickle Cell Anemia | Mendelian Disorders: Hemophilia |
86%
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The chromosomal theory of inheritance was proposed by :
| 1. | Thomas Morgan | 2. | Sutton and Boveri |
| 3. | Gregor Mendel | 4. | Robert Brown |
Subtopic: Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations |
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If a female individual is with a small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also, the physical, psychomotor and mental development is retarded. The karyotype analysis of such an individual will show:
| 1. | 47 chromosomes with XXY sex chromosomes |
| 2. | 45 chromosomes with XO sex chromosomes |
| 3. | 47 chromosomes with XYY sex chromosomes |
| 4. | Trisomy of chromosome 21 |
Subtopic: Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
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What is the expected percentage of F2 progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured constricted pod?
| 1. | 100% | 2. | 56.25% |
| 3. | 18.75 % | 4. | 9% |
Subtopic: Monohybrid Cross: 1 |
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