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Q. No.A trait displays continuous phenotypic variation and is spread across a gradient. Usually, the inheritance of this trait can be described as:
1. dominant-recessive inheritance
2. multiple-allele inheritance
3. polygenic inheritance
4. sex-linked inheritance
Subtopic: Polygenic Inheritance & Pleiotropy |
62%
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An F2 phenotypic ratio of 1: 4: 6: 4: 1 from a cross AaBb X AaBb is expected in the case of:
1. Dominant epistasis
2. Complementary genes
3. Polygenic inheritance
4. Independent assortment
1. Dominant epistasis
2. Complementary genes
3. Polygenic inheritance
4. Independent assortment
Subtopic: Polygenic Inheritance & Pleiotropy |
65%
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Human skin colour is a polygenic trait controlled by:
| 1. | 2 genes | 2. | 3 genes |
| 3. | 4 genes | 4. | 6 genes |
Subtopic: Polygenic Inheritance & Pleiotropy |
76%
From NCERT
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Identify the number of correct statements:
| I: | Polygenic inheritance takes into account the influence of the environment. |
| II: | In a polygenic trait, the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive. |
| III: | The normal distribution curve is bell-shaped in polygenic inheritance. |
| IV: | It is also known as quantitative inheritance. |
| 1. | 0 | 2. | 1 |
| 3. | 3 | 4. | 4 |
Subtopic: Polygenic Inheritance & Pleiotropy |
71%
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Consider the given two statements:
| Assertion(A): | In humans, an individual with genotype AABBCc will be similar in complexion to an individual with genotype AABBcc. |
| Reason(R): | The effect of each allele is additive in polygenic inheritance. |
| 1. | (A) is False but (R) is True. |
| 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 True but (R) is False. |
Subtopic: Polygenic Inheritance & Pleiotropy |
80%
From NCERT
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The type of distribution curve shown in the figure is seen in:
1. Co-dominance
2. Multiple allelism
3. Polygenic inheritance
4. Pleiotropy
1. Co-dominance
2. Multiple allelism
3. Polygenic inheritance
4. Pleiotropy
Subtopic: Polygenic Inheritance & Pleiotropy |
56%
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A male with genotype AABBCC and a very dark complexion mates with a female with genotype aabbcc and a very fair complexion. What is the probability of their progeny being born with an intermediate skin colour type?
1. 6/64
2. 15/64
3. 20/64
4. 1/64
1. 6/64
2. 15/64
3. 20/64
4. 1/64
Subtopic: Polygenic Inheritance & Pleiotropy |
53%
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: Polygenic Inheritance & Pleiotropy |
From NCERT
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Pleiotropy, a deviation from Mendel, refers to:
| 1. | Multiple genes influencing a single trait. |
| 2. | One gene having multiple effects on different traits. |
| 3. | A gene's effects being masked by another gene. |
| 4. | The inheritance of traits controlled by multiple alleles. |
Subtopic: Polygenic Inheritance & Pleiotropy |
86%
From NCERT
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