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Q. No.Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?
| 1. | Haemophilia | 2. | Thalassemia |
| 3. | Sickle-cell anaemia | 4. | Phenylketonuria |
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
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Match List-I with List-II:
Choose the correct answer from the options given below :
1. A-II, B-IV, C-III, D-I
2. A-I, B-III, C-II, D-IV
3. A-II, B-I, C-III, D-IV
4. A-I, B-IV, C-III, D-II
| List-I | List-II | ||
| A. | Incomplete dominance | I. | Human skin colour |
| B. | Co-dominance | II. | Inheritance of flower colour in Antirrhinum sp. |
| C. | Pleiotropy | III. | Phenylketonuria disease in humans |
| D. | Polygenic inheritance | Iv. | ABO blood groups |
Choose the correct answer from the options given below :
1. A-II, B-IV, C-III, D-I
2. A-I, B-III, C-II, D-IV
3. A-II, B-I, C-III, D-IV
4. A-I, B-IV, C-III, D-II
Subtopic: Miscellaneous |
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Which of the following statements are true with reference to the sex-determination in honeybees?
Choose the correct answer from the options given below:
| A. | An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker). |
| B. | An unfertilized egg develops as a male by parthenogenesis. |
| C. | A male has half the number of chromosomes than that of a female. |
| D. | Males produce sperm by meiosis. |
| E. | Honeybees have a haplodiploid sex-determination system. |
| 1. | B, C, D and E only | 2. | A, B, C and D only |
| 3. | A, B, D and E only | 4. | A, B, C and E only |
Subtopic: Sex Determination |
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The sixth mutant codon of beta globin gene causing polymerization of Haemoglobin and change in RBC shape is _____.
1. CAG
2. GUG
3. AUG
4. GAG
1. CAG
2. GUG
3. AUG
4. GAG
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
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What is the probability of having children with 'O' blood group, where both mother and father are heterozygous for 'A' and 'B' blood group, respectively ?
| 1. | 50% |
| 2. | 0% |
| 3. | 75% |
| 4. | 25% |
Subtopic: Polygenic Inheritance & Pleiotropy |
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In a population of a grasshopper species, the chromosome number of some members is 23 and some other members possess 24 chromosomes. The 23 and 24 chromosome-bearing members in this species are __________.
1. all males
2. all females
3. females and males, respectively
4. males and females, respectively
1. all males
2. all females
3. females and males, respectively
4. males and females, respectively
Subtopic: Sex Determination |
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In which animal do haploid cells divide mitotically to produce gametes?
| 1. | Male honeybees | 2. | Male grasshoppers |
| 3. | Male earthworms | 4. | Male frogs |
Subtopic: Sex Determination |
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Given below are two statements : one is labelled as assertion A and the other id labelled as reason R.
In the light of the above statements, choose the most appropriate answer from the options given below:
| Assertion (A): | In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf. |
| Reason (R): | Stem height is a contrasting trait, with tall being dominant and dwarf being recessive. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 1. | (A) is not correct but (R) is correct |
| 2. | Both (A) and (R) are correct and (R) is the correct explanation of (A) |
| 3. | Both (A) and (R) are correct but (R) is not the correct explanation of (A) |
| 4. | (A) is correct but (R) is not correct |
Subtopic: Mendel’s Laws of Inheritance |
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For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes ?
1. Father: \(I^AI^B\) and Mother: \(I^Ai~\)
2. Father: \(I^Ai\) and Mother: \(I^Bi~\)
3. Father: \(I^Ai\) and Mother: \(I^Ai~\)
4. Father: \(I^Bi\) and Mother: \(I^Bi~\)
1. Father: \(I^AI^B\) and Mother: \(I^Ai~\)
2. Father: \(I^Ai\) and Mother: \(I^Bi~\)
3. Father: \(I^Ai\) and Mother: \(I^Ai~\)
4. Father: \(I^Bi\) and Mother: \(I^Bi~\)
Subtopic: Dihybrid Cross Analysis | Dihybrid Cross: Details |
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Given below are two statements:
| Statement I: | Down's syndrome is caused by the absence of one of the X-chromosomes. |
| Statement II: | Turner's syndrome is caused by the presence of an additional copy of the chromosomes. |
| 1. | Statement I is incorrect but Statement II is correct |
| 2. | Both Statement I and Statement II are correct |
| 3. | Both Statement I and Statement II are incorrect |
| 4. | Statement I is correct but Statement II is incorrect |
Subtopic: Chromosomal Disorders |
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