Q. No.The phenomenon where a single gene exhibits multiple phenotypic expressions is called:
1. Co-dominance
2. Pleiotropy
3. Multiple alleles
4. Polygenic inheritance
1. Co-dominance
2. Pleiotropy
3. Multiple alleles
4. Polygenic inheritance
Subtopic: Â Polygenic Inheritance & Pleiotropy |
 83%
From NCERT
NEET - 2024
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below.
1. Statement I is True but Statement II is False
2. Statement I is False but Statement II is True
3. Both Statement I and Statement II are True
4. Both Statement I and Statement II are False
| Statement I: | When many alleles of single gene govern a character, it is called polygenic inheritance. |
| Statement II: | In polygenic inheritance, the effect of each allele is additive |
1. Statement I is True but Statement II is False
2. Statement I is False but Statement II is True
3. Both Statement I and Statement II are True
4. Both Statement I and Statement II are False
Subtopic: Â Polygenic Inheritance & Pleiotropy |
From NCERT
NEET - 2024
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| List-I Types of inheritance |
List-II Example |
||
| A. | Incomplete dominance | I. | Blood groups in human |
| B. | Co-dominance | II. | Flower colour in Antirrhinum |
| C. | Pleiotropy | III. | Skin colour in human |
| D. | Polygenic inheritance | IV. | Phenylketonuria |
1. A-III,B-IV, C-II, D-I
2. A-II, B-I, C-IV, D-III
3. A-II,B-III, C-I, D-IV
4. A-IV, B-I, C-III, D-II
Subtopic: Â Monohybrid Cross: 1 |Â Monohybrid Cross: Further Understanding |Â Polygenic Inheritance & Pleiotropy |Â Co-dominance |
 89%
From NCERT
NEET - 2024
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The phenomenon of pleiotropism refers to:
| 1. | more than two genes affecting a single character. |
| 2. | presence of several alleles of a single gene controlling a single crossover. |
| 3. | presence of two alleles, each of the two genes controlling a single trait. |
| 4. | a single gene affecting multiple phenotypic expressions. |
Subtopic: Â Polygenic Inheritance & Pleiotropy |
 80%
From NCERT
NEET - 2023
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Select the correct statements with respect to pleiotropism:
| (a) | A gene is said to be pleiotropic if it affects more than one trait |
| (b) | Phenylketonuria is an example of pleiotropy |
| (c) | A condition where one gene has several alleles is referred to as pleiotropism |
| (d) | A trait is said to be pleiotropic if several genes control it |
Choose the correct answer from the options given below:
1. (a) and (b) only
2. (a) and (d) only
3. (a), (b) and (c) only
4. (b), (c) and (d) only
Subtopic: Â Polygenic Inheritance & Pleiotropy |
 61%
From NCERT
NEET - 2022
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Assuming that fur colour of an animal ranges from dark, intermediates shades, to white. A cross is made between a male (AABBCC) with dark fur colour and a female (aabbcc) with white fur colour. What would be the fur colour of F1 generation?
1. All intermediate colour
2. Range of colour shade
3. All dark colour
4. All white colour
Subtopic: Â Polygenic Inheritance & Pleiotropy |
 67%
From NCERT
NEET - 2022
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The best example of pleiotropy is:
1. Skin color
2. Phenylketonuria
3. Colour Blindness
4. ABO Blood group
Subtopic: Â Polygenic Inheritance & Pleiotropy |
 72%
From NCERT
NEET - 2020
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Match the terms in Column-I with their description in Column-II and choose the correct option.
| Column-I | Column-II | ||
| A. | Dominance | 1. | Many govern a single character |
| B. | Codominance | 2. | In a heterozygous organism, only one allele expresses itself |
| C. | Pleiotropy | 3. | In a heterozygous organism, both alleles express themselves fully |
| D. | Polygenic inheritance | 4. | A single gene influences many characters |
| A | B | C | D | |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 4 | 1 | 2 | 3 |
| 3. | 4 | 3 | 1 | 2 |
| 4. | 2 | 1 | 4 | 3 |
Subtopic: Â Polygenic Inheritance & Pleiotropy |Â Co-dominance |
 91%
From NCERT
NEET - 2016
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A pleiotropic gene:
| 1. | Is expressed only in primitive plants |
| 2. | Is a gene that evolved during Pliocene |
| 3. | Controls a trait only in combination with another gene |
| 4. | Controls multiple traits in an individual |
Subtopic: Â Polygenic Inheritance & Pleiotropy |
 90%
From NCERT
NEET - 2015
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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: Â Polygenic Inheritance & Pleiotropy |
 91%
From NCERT
AIPMT - 2007
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