EASY
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The phenotypic ratio of polygenes representing skin colour in humans is

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Important Questions on Principles of Inheritance and Variation

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

Example of polygenic inheritance is 

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
What will be number of gene pairs controlling a single character in polygenic inheritance if the phenotypic ratio obtained in F2 generation is 1 : 6 : 15 : 20 : 15 : 6 : 1?
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

Human height is a multigenic character. If the heights of all the individuals living in a metropolis are measured and the percentages of the population belonging to a specific heat are plotted as shown below, which of the plots would represent the most realistic distribution?
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EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Which of the following characteristics represent 'Inheritance of blood groups' in humans?
i. Dominance
ii. Co-dominance
iii. Multiple alleles
iv. Incomplete dominance
v. Polygenic inheritance
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

Match the following 

   List - I     List - II
(a) Holandric genes (i) Pleiotropy
(b) Multiple effects of a single gene (ii) Hypertrichosis
(c) Skin colour in man (iii) Multiple Alleles
(d) ABO Blood types (iv) Polygenic inheritance

The correct answer is

HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Explain Polygenic inheritance with example.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
The gene that controls many characters is called
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
If one gene influences many phenotypic traits, the phenomenon is called
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Choose the possible genotypes responsible for lightest skin colour in human beings.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Which of the following pairs is wrongly matched?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism

The best example for pleiotropy is:

MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Match the terms in Column-I with their description in Column-II and choose the correct option:
 
Column – I Column – II
(a) Dominance (i) Many genes govern a single character
(b) Codominance (ii) In a heterozygous organism, only one allele expresses itself
(c) Pleiotropy (iii) In a heterozygous organism, both alleles express themselves fully
(d) Polygenic inheritance (iv) A single gene influences many characters
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
The phenotype of one parent for skin colour is AABBCC and other parent is aabbcc. What will be the skin colour and genotype for their progeny?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
A gene showing codominance has
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
The genotypes of a Husband and Wife are IA IB and IAi .
Among the blood types of their children, how many different genotypes and phenotypes are possible?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
Multiple alleles are present:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
One of the following is quantitative abnormality of polypeptide globin chain synthesis
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
In a mating between two mulattos, each heterozygous at all three gene loci for the skin colour, what is the chance their child will have very light skin?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Deviation from Mendelism
A pleiotropic gene