Assertion(A): Deletion, insertion, and duplication of a segment of DNA result in alteration in chromosomes.
Reason(R): Alteration in chromosomes results in abnormalities.
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. (A) is false, but (R) is true.

Subtopic:  Mutation |
 67%
Level 2: 60%+
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Assertion(A): Linkage maps show the arrangement of genes on a chromosome.
Reason(R): The genes which are closely located on the same chromosomes follow the law of independent assortment.
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. (A) is false, but (R) is true.
Subtopic:  SUMMARY |
 79%
Level 2: 60%+
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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%
Level 1: 80%+
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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 |
Level 3: 35%-60%
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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 |
 76%
Level 2: 60%+
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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
Subtopic:  Sex Determination |
 75%
Level 2: 60%+
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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 |
 74%
Level 2: 60%+
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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
Subtopic:  Pedigree Analysis: Basics | Pedigree Analysis: Problem Solving |
Level 3: 35%-60%
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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 |
 71%
Level 2: 60%+
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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
Subtopic:  Mendelian Disorders: Thalassemia | Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
 89%
Level 1: 80%+
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