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Q. No.Consider the given two statements:
Assertion (A):
The strength of linkage between two genes is directly proportional to the distance between them on the chromosome.
Reason (R):
Genes that are farther apart are less likely to be separated by recombination.
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, (R) is False.
Subtopic: Linkage |
59%
From NCERT
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Which statement is true about sickle cell anemia?
| 1. | It is caused by a mutation that results in a valine to glutamic acid substitution in hemoglobin. |
| 2. | It is inherited as an autosomal recessive condition. |
| 3. | Individuals with one sickle cell allele are typically severely affected. |
| 4. | Sickle cell anemia results from a deletion mutation in the hemoglobin gene. |
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
69%
From NCERT
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The critical difference between sickle cell anemia and thalassemia is:
| 1. | Sickle cell anemia is caused by a single gene/point, while thalassemia is due to the deletion of one or more genes |
| 2. | Sickle cell anemia affects the white blood cells, whereas thalassemia affects the red blood cells |
| 3. | Thalassemia results in increased hemoglobin synthesis, whereas sickle cell anemia does not |
| 4. | Sickle cell anemia can be cured, while thalassemia cannot |
Subtopic: Mendelian Disorders: Sickle Cell Anemia | Mendelian Disorders: Thalassemia |
95%
From NCERT
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Which of the following terms describes an individual having two identical alleles for a trait?
1. Hemizygous
2. Homozygous
3. Heterozygous
4. Hybrid
1. Hemizygous
2. Homozygous
3. Heterozygous
4. Hybrid
Subtopic: Monohybrid Cross: 1 |
93%
From NCERT
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Consider the given two statements:
| Assertion (A): | In a Mendelian monohybrid cross, the F2 generation exhibits a phenotypic ratio of 3:1. |
| Reason (R): | This ratio occurs because alleles segregate independently during gamete formation and recombine randomly during fertilization. |
| 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: Monohybrid Cross: 1 |
70%
From NCERT
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A pedigree analysis for a certain family shows that the trait in question is more common in the males than in females and all the sons of affected mother and unaffected father are affected whereas no daughter is affected by the trait. The trait is most likely inherited as:
1. Autosomal dominant
2. Autosomal recessive
3. X-linked recessive
4. X-linked dominant
1. Autosomal dominant
2. Autosomal recessive
3. X-linked recessive
4. X-linked dominant
Subtopic: Pedigree Analysis: Basics |
81%
From NCERT
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Consider the given two statements:
| Assertion (A): | A sperm or egg carries only one allele for each inherited trait. |
| Reason (R): | Allele pairs separate during gamete production |
| 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: Sex Determination |
88%
From NCERT
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In honey bees, the sex of an individual is determined by the number of chromosome sets it possesses. Which of the following scenarios would most likely disrupt normal sex determination in a honey bee population?
| 1. | A mutation in the queen bee that causes her to lay diploid eggs that develop without fertilization. |
| 2. | Increased production of royal jelly, leading to the development of more queen bees. |
| 3. | A mutation in drone bees that allows them to produce sperm with a different chromosome count. |
| 4. | Introduction of a new species of bee that competes for the same food sources |
Subtopic: Sex Determination |
51%
From NCERT
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What proportion of the progeny of a cross AaBb X AaBb [assume complete dominance and independent assortment] will be homozygous at least at one of the two loci?
1. 1/4
2. 9/16
3. 6/16
4. 3/4
1. 1/4
2. 9/16
3. 6/16
4. 3/4
Subtopic: Dihybrid Cross Analysis |
From NCERT
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Why do male honeybees (drones) not have fathers?
1. They are produced asexually from the queen.
2. They develop from unfertilized eggs.
3. They undergo spontaneous generation.
4. They are clones of their mother.
1. They are produced asexually from the queen.
2. They develop from unfertilized eggs.
3. They undergo spontaneous generation.
4. They are clones of their mother.
Subtopic: Sex Determination |
80%
From NCERT
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