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Q. No.What decides the frequency of an allele in a population?
| 1. | Dominance |
| 2. | Its location on a particular chromosome |
| 3. | Its degree of expression |
| 4. | Natural selection |
Subtopic: Introduction to Genetics: 1 | Introduction to Genetics: 2 |
Level 3: 35%-60%
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It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the:
| 1. | results of the F3 generation of a cross |
| 2. | observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending |
| 3. | self-pollination of F1 offspring |
| 4. | cross-pollination of F1 generation with recessive parent |
Subtopic: Monohybrid Cross: 1 |
69%
Level 2: 60%+
Hints
Consider the given two statements:
| Assertion (A): | When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters. |
| Reason (R): | During gamete formation, the alleles for each gene segregate from each other. |
| 1. | (A) is True but (R) is False |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
| 4. | (A) is False but (R) is True |
Subtopic: Monohybrid Cross: Further Understanding | Dihybrid Cross: Details |
Level 3: 35%-60%
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Identify the incorrect statement:
| 1. | Mendel found the phenotype of the F1 heterozygote Tt to be exactly like the TT parent in appearance. |
| 2. | He proposed that in a pair of dissimilar factors, one dominates the other. |
| 3. | It is convenient (and logical) to use the capital and lower case of an alphabetical symbol to remember this concept of dominance and recessiveness. |
| 4. | It is convenient (and logical) to use the capital and lower case of different alphabets symbol to remember this concept of dominance and recessiveness. |
Subtopic: Monohybrid Cross: Further Understanding |
82%
Level 1: 80%+
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Consider the two statements:
| Statement I: | The dominant phenotype can be produced only by an organism with a homozygous dominant genotype. |
| Statement II: | The results of a test cross indicate whether an individual with the dominant phenotype is heterozygous or homozygous dominant. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Monohybrid Cross: Further Understanding |
74%
Level 2: 60%+
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Consider the two statements:
| Statement I: | In co-dominance, the F1 progeny resembles neither of the parents. |
| Statement II: | In incomplete dominance, the F1 progeny resembles both parents. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Monohybrid Cross: 1 | Co-dominance |
79%
Level 2: 60%+
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Consider the given two statements:
| Statement I: | In incomplete dominance and co-dominance, the F2 phenotypic ratio and genotypic ratio are identical. |
| Statement II: | Incomplete dominance and co-dominance are examples of blending inheritance. |
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
Subtopic: Monohybrid Cross: 1 | Co-dominance |
Level 3: 35%-60%
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Based on the law of dominance, select the correct statement(s):
1. Only I is correct
2. I and II are correct
3. I and III are correct
4. All are correct
| I. | The dominant allele masks the expression of the recessive allele. |
| II. | Dominance is an all-or-nothing feature. |
| III. | Dominance can sometimes be incomplete. |
2. I and II are correct
3. I and III are correct
4. All are correct
Subtopic: Monohybrid Cross: 1 |
Level 4: Below 35%
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Evaluate the following statements and choose the correct option regarding the principles of inheritance:
1. I, II and III are correct.
2. II, III and IV are correct.
3. I, III and IV are correct.
4. All statements are correct.
| I: | If both parents are carriers for an autosomal recessive genetic disorder, there is a 25% chance that any child they have will express the disorder. |
| II: | In Incomplete dominance, the F2 phenotypic and genotypic ratios are identical. |
| III: | Codominance involves the expression of both alleles at a locus in a heterozygote. |
| IV: | A testcross involves crossing a homozygous recessive individual with an individual whose genotype is unknown. |
2. II, III and IV are correct.
3. I, III and IV are correct.
4. All statements are correct.
Subtopic: Dominance Deviation from Mendel: 1 | Mendelian Disorders |
66%
Level 2: 60%+
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Consider the given two statements:
| Assertion (A): | Although Mendel published his work on inheritance of characters in 1865 but it remained unrecognised till 1900. |
| Reason (R): | In 1900, three Scientists, Avery, Macleod, McCarty, independently rediscovered Mendel’s results on the inheritance of characters. |
| 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: Chromosomal Basis of Inheritance: Introduction |
Level 3: 35%-60%
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