The phenomenon where a single gene exhibits multiple phenotypic expressions is called:
1. Co-dominance
2. Pleiotropy
3. Multiple alleles
4. Polygenic inheritance
Subtopic:  Polygenic Inheritance & Pleiotropy |
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From NCERT
NEET - 2024
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Given below are two statements:
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 
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 
Subtopic:  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
Choose the correct answer from the options given below:
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:  Monohybrid Cross: 1 | Monohybrid Cross: Further Understanding | Polygenic Inheritance & Pleiotropy | Co-dominance |
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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:  Polygenic Inheritance & Pleiotropy |
 77%
From NCERT
NEET - 2023
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Select the correct statements with respect to pleiotropism:

(a) A gene is said to be pleiotropy 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:  Polygenic Inheritance & Pleiotropy |
 60%
From NCERT
NEET - 2022
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Assuming that fur colour of an animal is dark, range of colour shade and 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:  Polygenic Inheritance & Pleiotropy |
 64%
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:  Polygenic Inheritance & Pleiotropy |
 70%
From NCERT
NEET - 2020
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