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Q. No.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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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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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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Consider the given two statements:
| Assertion (A): | The underlying mechanism of pleiotropy in most cases is the effect of a gene on metabolic pathways which contribute towards different phenotypes. |
| Reason (R): | Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits. |
| 1. | (A) is False but (R) is True |
| 2. | (A) is True but (R) is False |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
Subtopic: Polygenic Inheritance & Pleiotropy |
From NCERT
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Consider the given two statements:
| Assertion (A): | UV radiations can cause mutations in organisms – it is a mutagen. |
| Reason (R): | UV radiations are ionising radiations. |
| 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: Mutation |
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Consider the given two statements:
| Assertion (A): | Pedigree analysis is used for the analysis of inheritance of genetic traits in human families. |
| Reason (R): | Choice matings are not possible in humans and the number of progeny are also limited, usually. |
| 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: Pedigree Analysis: Basics |
From NCERT
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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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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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Genes assort independently if they are situated on the:
1. heterologous chromosomes
2. homologous chromosomes
3. extra nuclear genetic element
4. same chromosome
1. heterologous chromosomes
2. homologous chromosomes
3. extra nuclear genetic element
4. same chromosome
Subtopic: Chromosomal Basis of Inheritance: Introduction |
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| Assertion (A): | X- linked recessive disorders are more common in the males. |
| Reason (R): | Males with a sex chromosome complement, XY, are heterozygous for X-linked recessive disorders. |
| 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, (R) is False |
| 4. | (A) is False, (R) is False |
Subtopic: Sex Linked Recessive Inheritance |
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