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Q. No.Dominance:
| 1. | is an autonomous feature of an allele |
| 2. | is inherent in the phenotype expressed by an allele |
| 3. | is a relationship between two alleles of a gene and their associated phenotypes |
| 4. | determines whether an allele is deleterious, neutral or advantageous |
Subtopic: Introduction to Genetics: 2 |
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Consider the given two statements:
| I: | In a test cross, the allele the individual in question [one that expresses the dominant phenotype] passes on, determines the phenotype of the offspring. |
| II: | The homozygous recessive individual can only pass on recessive alleles. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
Subtopic: Monohybrid Cross: Further Understanding |
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Starch synthesis in pea seeds is controlled by one gene. What will be true?
| Statement I: | BB homozygotes produce large starch grains, Bb heterozygotes produce large starch grains and bb homozygotes produce smaller starch grains. |
| Statement II: | BB homozygotes produce round seeds, Bb heterozygotes produce oval seeds and bb homozygotes produce wrinkled seeds. |
| 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: Co-dominance |
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In a monohybrid test cross involving F1 heterozygous plants, the expected progeny ratio is:
1. 3 : 1
2. 1 : 1
3. 9 : 3 : 3 : 1
4. All offspring will show the dominant trait
1. 3 : 1
2. 1 : 1
3. 9 : 3 : 3 : 1
4. All offspring will show the dominant trait
Subtopic: Monohybrid Cross: 1 |
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Consider the given two statements:
| Assertion (A): | In incomplete dominance, segregation of unit factors does not take place. |
| Reason (R): | Incomplete dominance is blending inheritance. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding |
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What does the principle of segregation in genetics state?
| 1. | Alleles separate so that each gamete carries only one allele for each gene. |
| 2. | Genes for different traits can segregate independently during the formation of gametes. |
| 3. | Each allele in a pair segregates into a different sex chromosome. |
| 4. | Phenotypes segregate during gamete formation, leading to genetic variation. |
Subtopic: Law of Segregation and Law of Independent Assortment |
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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 |
From NCERT
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In a dihybrid cross, AaBb X AaBb, assuming independent assortment, what proportion of progeny are expected to express either of the dominant phenotype?
| 1. | 3/16 | 2. | 6/16 |
| 3. | 9/16 | 4. | 1/16 |
Subtopic: Dihybrid Cross Analysis |
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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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Consider the following statements about linked genes:
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statements are correct.
4. Neither Statement is correct.
| I: | Linked genes are always found on different chromosomes. |
| II: | Recombination between linked genes does not occur. |
2. Only Statement II is correct.
3. Both Statements are correct.
4. Neither Statement is correct.
Subtopic: Linkage |
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