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Q. No.Assertion (A): For recessive autosomal disease both parents are normal and their first son is diseased.
Reason (R): Both the parents are heterozygous
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
72%
From NCERT
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Assertion (A): The physical distance between two genes determines the frequency of cross-over.
Reason (R): One cross-over reduces the occurrence of another cross-over in its vicinity
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Reason (R): One cross-over reduces the occurrence of another cross-over in its vicinity
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Linkage | Recombination Gene Mapping |
50%
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The nearer two genes are on a chromosome:
| 1. | the higher the chance of recombination between them. |
| 2. | the lower the chance of recombination between them. |
| 3. | the lower the chance of both being dominant alleles. |
| 4. | the higher the chance of both being dominant alleles. |
Subtopic: Recombination & Gene Mapping |
83%
From NCERT
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Consider the given statements:
| Assertion (A): | Even if a character shows multiple allelism, an individual will only have two alleles for that character. |
| Reason (R): | The somatic cells of an individual have only two chromosomes. |
| 1. | (A) is True but (R) is False. |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
From NCERT
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All the following are recessive traits in Pisum sativum except:
| 1. | Green pod colour |
| 2. | Green seed colour |
| 3. | Terminal flower position |
| 4. | Constricted pod shape |
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 |
75%
From NCERT
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Sex determination is based on the number of sets of chromosomes an individual receives in:
1. Honeybees
2. Grasshoppers
3. Fruit fly
4. Birds
1. Honeybees
2. Grasshoppers
3. Fruit fly
4. Birds
Subtopic: Sex Determination |
73%
From NCERT
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α Thalassemia is controlled by:
| 1. | two closely linked genes on chromosome 16 |
| 2. | two closely linked genes on chromosome 11 |
| 3. | a single gene on chromosome 11 |
| 4. | a single gene on chromosome 16 |
Subtopic: Mendelian Disorders: Thalassemia |
73%
From NCERT
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The given pedigree shows the inheritance pattern of a rare mutant phenotype (filled-in symbols) in humans. What is the most likely mode of inheritance of the trait?
1. Autosomal recessive
2. Sex-linked recessive
3. Autosomal dominant
4. Sex-linked dominant
1. Autosomal recessive
2. Sex-linked recessive
3. Autosomal dominant
4. Sex-linked dominant
Subtopic: Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
From NCERT
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The son of a woman who carries the gene for colour blindness [but herself is not affected]:
| 1. | can never be colour blind |
| 2. | has a 25 per cent chance of being colour blind |
| 3. | has a 50 per cent chance of being colour blind |
| 4. | has a 100 per cent chance of being colour blind |
Subtopic: Mendelian Disorders |
70%
From NCERT
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Which of the following conditions is not a case of aneuploidy?
1. Down’s syndrome
2. Turner’s syndrome
3. Thalassemia
4. Klinefelter’s syndrome
1. Down’s syndrome
2. Turner’s syndrome
3. Thalassemia
4. Klinefelter’s syndrome
Subtopic: Mendelian Disorders: Thalassemia | Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
90%
From NCERT
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