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Q. No.What is the probability of having a child with a medium skin color in humans if both parents are heterozygous (AaBbCc)?
| 1. | 1/64 | 2. | 6/64 |
| 3. | 15/64 | 4. | 20/64 |
Subtopic: Â Polygenic Inheritance & Pleiotropy |
From NCERT
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Consider the given two statements:
| Assertion (A): | Polygenic traits are quantitative because they involve multiple genes. |
| Reason (R): | In such traits the genes involved have more than two alleles. |
| 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: Â Polygenic Inheritance & Pleiotropy |
From NCERT
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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: Â Polygenic Inheritance & Pleiotropy |
From NCERT
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Which of the following are characteristics of polygenic traits?
Select the correct answer from the options below:
1. 1, 3
2. 2, 3
3. 2, 3, 4
4. 1, 2, 3, 4
| 1. | A single gene controls multiple phenotypes. |
| 2. | Phenotypes show a continuous range of variation. |
| 3. | Environment influences the expression of the trait. |
| 4. | Genes contributing to the trait show codominance. |
1. 1, 3
2. 2, 3
3. 2, 3, 4
4. 1, 2, 3, 4
Subtopic: Â Polygenic Inheritance & Pleiotropy |
From NCERT
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Q. No.
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