Q. No.An inherited disorder caused by a defective or absent enzyme is called a(an)
1. karyotype
2. trisomy
3. reciprocal translocation
4. inborn error of metabolism
1. karyotype
2. trisomy
3. reciprocal translocation
4. inborn error of metabolism
Subtopic: Mendelian Disorders |
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Level 1: 80%+
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Why are X-linked recessive traits more frequently observed in males than in females?
| 1. | Males inherit two X chromosomes, making them more susceptible to mutations. |
| 2. | Males have only one X chromosome, so a single mutated allele is sufficient to express the trait. |
| 3. | Females inherit only one X chromosome, making it less likely for them to inherit two defective alleles. |
| 4. | X-linked recessive traits do not require inheritance from both parents to be expressed in females. |
Subtopic: Mendelian Disorders |
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Level 1: 80%+
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Match the following Mendelian disorders with their characteristics:
Choose the correct matching:
| Disorder | Characteristics | ||
| A. | Haemophilia | 1. | Autosomal recessive; deficiency of enzyme converting phenylalanine to tyrosine |
| B. | Phenylketonuria | 2. | X-linked recessive; defect in blood clotting protein |
| C. | Sickle-cell anaemia | 3. | Autosomal recessive; quantitative problem - too few globin chains synthesized |
| D. | Thalassemia | 4. | Autosomal recessive; qualitative problem - Glu→Val substitution in \(\beta\)-globin |
| 1. | A-2, B-1, C-4, D-3 | 2. | A-1, B-2, C-3, D-4 |
| 3. | A-3, B-4, C-1, D-2 | 4. | A-4, B-3, C-2, D-1 |
Subtopic: Mendelian Disorders: Sickle Cell Anemia | Mendelian Disorders | Mendelian Disorders: Hemophilia | Mendelian Disorders: Thalassemia |
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Level 1: 80%+
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Red-green colour blindness is a sex-linked recessive disorder caused by a mutation in genes located on the X chromosome. Why is this disorder more common in males than in females?
| 1. | Males inherit the Y chromosome from their father, which carries the color blindness gene. |
| 2. | Males inherit only one X chromosome, so a single defective allele results in color blindness. |
| 3. | The disorder is caused by a dominant gene, making it more frequent in males. |
| 4. | Females have a higher rate of mutations in their X chromosome, preventing color blindness. |
Subtopic: Mendelian Disorders |
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Level 1: 80%+
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Which of the following is an example of Mendelian disorder?
| 1. | Klinefelter's syndrome |
| 2. | Down's syndrome |
| 3. | Turner's syndrome |
| 4. | Thalassemia |
Subtopic: Mendelian Disorders | Mendelian Disorders: Thalassemia |
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Level 1: 80%+
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Phenylketonuria is an example of:
1. A sex-linked dominant disorder
2. A sex-linked recessive disorder
3. An autosomal recessive disorder
4. An autosomal dominant disorder
1. A sex-linked dominant disorder
2. A sex-linked recessive disorder
3. An autosomal recessive disorder
4. An autosomal dominant disorder
Subtopic: Mendelian Disorders |
90%
Level 1: 80%+
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Phenylketonuria (PKU) is a metabolic disorder caused by:
| 1. | Excessive breakdown of tyrosine into phenylalanine |
| 2. | Overproduction of phenylalanine, leading to excessive protein synthesis |
| 3. | Deficiency of essential amino acids in the diet |
| 4. | Accumulation of phenylalanine due to the absence of a converting enzyme |
Subtopic: Mendelian Disorders |
89%
Level 1: 80%+
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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; a 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 | Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
88%
Level 1: 80%+
NEET - 2022
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X-linked recessive traits like red-green colour blindness in humans are observed:
| 1. | more commonly in males than in females |
| 2. | more commonly in females than in males |
| 3. | in males and in females equally |
| 4. | only in the males and never in the females |
Subtopic: Mendelian Disorders |
88%
Level 1: 80%+
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Match List-I with List-II:
Choose the correct answer from the options given below:
1. A-II, B-III,C-IV, D-I
2. A-III, B-IV,C-I, D-II
3. A-IV, B-I, C-II, D-III
4. A-I, B-II, C-III, D-IV
| List-I | List-II | ||
| A. | Down's syndrome | I. | \(11^{\text {th }}\) chromosome |
| B. | \(\alpha\) -Thalassemia | II. | \(' \mathrm{X} '\) chromosome |
| C. | \(\beta\) -Thalassemia | III. | \(21^{\text {st }}\) chromosome |
| D. | Klinefelter's syndrome |
IV. | \(16^{\text {th }}\) chromosome |
Choose the correct answer from the options given below:
1. A-II, B-III,C-IV, D-I
2. A-III, B-IV,C-I, D-II
3. A-IV, B-I, C-II, D-III
4. A-I, B-II, C-III, D-IV
Subtopic: Mendelian Disorders | Chromosomal Disorders |
88%
Level 1: 80%+
NEET - 2024
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