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Q. No.A woman is of blood type A. Her daughter is type O and her son is type B. Which of the following is a possible phenotype for the father?
1. A
2. O
3. B
4. AB
Subtopic: Polygenic Inheritance & Pleiotropy |
79%
Level 2: 60%+
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Pleiotropy refers to a phenomenon where:
1. A single gene influences multiple traits
2. Multiple genes control a single trait
3. Two genes are located on the same chromosome
4. A trait is influenced by environmental factors
1. A single gene influences multiple traits
2. Multiple genes control a single trait
3. Two genes are located on the same chromosome
4. A trait is influenced by environmental factors
Subtopic: Polygenic Inheritance & Pleiotropy |
85%
Level 1: 80%+
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Inheritance of skin colour in humans is an example of:
| 1. | chromosomal aberration |
| 2. | point mutation |
| 3. | polygenic inheritance |
| 4. | codominance |
Subtopic: Polygenic Inheritance & Pleiotropy |
91%
Level 1: 80%+
AIPMT - 2007
Hints
Consider the given two statements:
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
| Statement I: | Besides the involvement of multiple genes polygenic inheritance also takes into account the influence of environment. |
| Statement II: | In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive. |
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: Polygenic Inheritance & Pleiotropy |
90%
Level 1: 80%+
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Consider the given two statements:
| A: | In a polygenic trait the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive. |
| B: | Since in an individual only two alleles can be present, multiple alleles can be found only when population studies are made. |
| 1. | Only A is correct |
| 2. | Only B is correct |
| 3. | Both A and B are correct |
| 4. | Both A and B are incorrect |
Subtopic: Polygenic Inheritance & Pleiotropy | Co-dominance |
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In a certain organism, three non-allelic gene pairs affect the same character in the same way. This would be called as:
1. Pleiotropy
2. Total Penetrance
3. Variable Expressivity
4. Polygenic Inheritance
1. Pleiotropy
2. Total Penetrance
3. Variable Expressivity
4. Polygenic Inheritance
Subtopic: Polygenic Inheritance & Pleiotropy |
82%
Level 1: 80%+
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What is the genetic mechanism behind polygenic inheritance in traits like human skin color?
| 1. | A single gene controls a wide range of phenotypes. |
| 2. | The dominant allele from one gene suppresses the others. |
| 3. | Only environmental factors influence the phenotype. |
| 4. | Three or more genes contribute additively to the phenotype. |
Subtopic: Polygenic Inheritance & Pleiotropy |
82%
Level 1: 80%+
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Consider the given two statements:
| Assertion (A): | Pleiotropy occurs when one gene influences multiple phenotypic traits. |
| Reason (R): | The gene product is involved in multiple biochemical pathways or affects several body systems. |
| 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: Polygenic Inheritance & Pleiotropy |
84%
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In humans, the gene responsible for phenylketonuria (PKU) also affects skin pigmentation and intellectual development. This phenomenon is an example of:
1. Polygenic inheritance
2. Multiple alleles
3. Codominance
4. Pleiotropy
1. Polygenic inheritance
2. Multiple alleles
3. Codominance
4. Pleiotropy
Subtopic: Polygenic Inheritance & Pleiotropy |
74%
Level 2: 60%+
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